Merge branch 'bugfix/fix-version-detection-in-dune-python-find-package' into 'master'

[bugfix] fix version detection in `dune_python_find_package`

Closes #75

See merge request !364

cmake/modules/DunePythonFindPackage.cmake

@@ -84,14 +84,13 @@ function(dune_python_find_package)
                     RESULT_VARIABLE retcode
                     OUTPUT_VARIABLE VERSION_STRING
                     OUTPUT_STRIP_TRAILING_WHITESPACE
-                    OUTPUT_QUIET
                     )
 
     set(${PYPACKAGE_RESULT} TRUE)
     if("${retcode}" STREQUAL "0")
       if(("${VERSION_STRING}" VERSION_LESS "${PYPACKAGE_VERSION}") OR
          (PYPACKAGE_EXACT AND NOT ("${VERSION_STRING}" VERSION_EQUAL "${PYPACKAGE_VERSION}")))
-        set(PYPACKAGE_RESULT FALSE)
+        set(${PYPACKAGE_RESULT} FALSE)
       endif()
     else()
       set(VERSION_STRING "unknown version")