:wrench: Add error handling for TIFF functions

[PdlAyush]

There are some scenarios where the error handling in (lines 69-76) is unable to detect and remove corrupt .tiff files in the map-cache directory. I was able to create one such scenario by:

• creating a spam request to spam the map-server
• using std::this_thread::sleep_for () to create a delay before our curlpp::Easy request; is performed. While doing so I get the error:

  TIFFFillStrip: Read error on strip `x`; got `y` bytes expected `z`.

The corrupt .tiff file wouldn't be removed. So the return of TIFFGetField() and TIFFReadScanline() is checked to remove such corrupt .tiff files.

[coveralls]

Pull Request Test Coverage Report for Build 4784801538

• 0 of 11 (0.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.0005%) to 1.141%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
plugins/csp-lod-bodies/src/TileSourceWebMapService.cpp	0	11	0.0%
<!--	Total:	0	11	0.0%	-->

Files with Coverage Reduction	New Missed Lines	%
plugins/csp-lod-bodies/src/TileSourceWebMapService.cpp	1	0%
<!--	Total:	1		-->

Totals
Change from base Build 4700956288:	-0.0005%
Covered Lines:	193
Relevant Lines:	16920

---

💛 - Coveralls

[PdlAyush]

Thank you for your feedback, sorry for the two commits, the latest commit is absolutely not needed as I am just using TIFFGetField() twice. Could you please only merge upto commit - 8bee368.

[Schneegans]

Thank you for implementing the changes. I think I cannot easily choose which commits to merge. Please undo the changes of that commit with a new commit. I'll will then squash-merghe this in the end.

Also, it would be great if you could add a note to the changelog for this bug fix (under "Bug Fixes" for the upcoming v1.8.0).