Missing pytest-3 tool lets the build fail

[astumpf]

Since the new version, the build fails due to missing pytest-3 on all machines:

cmake_clang_tools/CMakeLists.txt

Line 78 in 13a66a6

COMMAND pytest-3 ${CMAKE_SOURCE_DIR}/test

I suggest either to extend the CMakeLists.txt either to automatically install the pytest-3 tool or at least just check if it is available on the machine. As this issue targets testing, I wonder if some kind of build flag for enabling tests would be the ideal solution, so this part can be skipped.
Otherwise it should be listed in the README as dependency.

[samuelba]

Thanks for reporting this. A fix is in progress.

[hogabrie]

Was resolved by 19cf54f, closing.