[cmake] Catch non-existing target properties for the dependency lookout.

Author: jnbrunet

CMake/SofaPython3Tools.cmake

@@ -154,7 +154,7 @@ function(SP3_add_python_module)
     foreach(DEPENDENCY ${A_DEPENDS})
         if (TARGET ${DEPENDENCY})
             get_target_property(DEPENDENCY_LIBRARY_OUTPUT_DIRECTORY "${DEPENDENCY}" LIBRARY_OUTPUT_DIRECTORY)
-            if (NOT "${DEPENDENCY_LIBRARY_OUTPUT_DIRECTORY}" STREQUAL "")
+            if (DEPENDENCY_LIBRARY_OUTPUT_DIRECTORY)
                 file(RELATIVE_PATH dependency_path_from_packages "${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${SP3_PYTHON_PACKAGES_DIRECTORY}" "${DEPENDENCY_LIBRARY_OUTPUT_DIRECTORY}")
                 if (NOT "${dependency_path_from_packages}" STREQUAL "" AND NOT "${dependency_path_from_packages}" STREQUAL "../")
                     list(APPEND ${A_TARGET}_DEPENDECIES_RPATH "$ORIGIN/../${dependency_path_from_packages}")