What is claimed is:1. An assembled media line, comprising:a media line,a first line connector and a second line connector, anda first sheathing system,where the media line has a first end and a second end and where the first line connector is connected to the first end and the second line connector is connected to the second end of the media line and the first sheathing system at least partially surrounds the media line and extends along the media line, wherein the media line is not dimensionally stable,wherein at least one contour shaping cap device is provided as a second sheathing system which contour shaping cap device is axially locked and/or mechanically locked to the first sheathing system, wherein the at least one contour shaping cap device completely surrounds the first sheathing system circumferentially,where the contour shaping cap device comprises at least two parts which together build, at least in sections, a media line surrounding sheath and which at least two parts are generally bending resistant,where the contour shaping cap device is positioned fixed in an axial direction along the media line and builds the second sheathing system surrounding the first sheathing system such that a local increase of rigidity of the assembled media line and/or an additional isolation effect is/are provided, andwherein a first isolating cap surrounds the first line connector and a second isolating cap surrounds the second line connector, as part of the first sheathing system.2. The assembled media line according to claim 1, wherein a gap filled with air is provided between the first sheathing system and the inside of the second sheathing system of the contour shaping cap device.3. The assembled media line according to claim 1, wherein the contour shaping cap device is made of or comprises a fiber-reinforced material.4. The assembled media line according to claim 1, wherein the media line is a heatable media line and the first sheathing system comprises a corrugated pipe where a heating means is provided between the media line and the corrugated pipe.5. The assembled media line according to claim 1, wherein the material of the media line provided as a flexible hose line is Ethylene-Propylene-Dien-Monomer rubber (EPDM) or the material of the media line provided as a flexible tube is Polyamide (PA).6. The assembled media line according to claim 1, wherein the at least two parts have means for connecting them to one another, wherein the at least one contour shaping cap device has ribs to increase the rigidity of the at least one contour shaping cap device or to increase an isolation effect when provided surrounding the media line or the at least one first sheathing system surrounding the media line at least in sections.7. The assembled media line according to claim 6, wherein the at least two parts of the at least one contour shaping cap device are two half-shells.8. The assembled media line according to claim 6, wherein the ribs are provided on the inside of at least one of the half-shells for interlocking with ribs of the corrugated pipe provided as a component of the first sheathing system surrounding the media line.9. The assembled media line according to claim 6, wherein elements are provided on the at least one contour shaping cap device for axially and/or radially positioning of fastening devices.10. The assembled media line according to claim 9, wherein at least one projecting element is provided on the outside of at least one part of the at least one contour shaping cap device for positioning a holding or fixing or fastening means, such as a cable tie, on the outside of the at least one contour shaping cap device.11. The assembled media line according to claim 6, wherein at least one part of the at least two parts of the contour shaping cap device has at least one fixing or holding element on its outer side for fixing or holding the at least one part by a fixing or holding device interlocking with the part's fixing or holding element.12. The assembled media line according to claim 11, wherein the at least one fixing or holding element is an ear extending on the outer side of the at least one part of the at least two parts of the at least one contour shaping cap device.13. The assembled media line according to claim 6, wherein openings are provided in at least one of the at least two parts of the at least one contour shaping cap device for preventing the formation of ice inside the isolation formed by the at least one contour shaping cap device.14. The assembled media line according to claim 6, wherein at least one sealing is provided inside the isolation formed by the at least one contour shaping cap device.15. The assembled media line according to claim 14, wherein the at least one sealing is at least one sealing element layer or at least one sealing at the joints or interstices of the at least two parts of the at least one contour shaping cap device.16. The assembled media line according to claim 7, wherein the two half-shells are shaped as modules mating with each other such that any of the two half-shells can be connected with any of the half-shells to provide a modular design.17. The assembled media line according to claim 7, wherein the two half-shells are shaped as common parts or same parts.18. A vehicle comprising at least one assembled media line according to claim 1.