fixed: do not enable tensorflow test without tensorflow on the system

tensorflow is too heavy to drag in as a dependency for everyone

pythonIntegrationTests.cmake

@@ -1,6 +1,12 @@
 file(MAKE_DIRECTORY ${PROJECT_BINARY_DIR}/tests/integration/HybridNewton)
-
-add_test(NAME
+execute_process(
+  COMMAND "${Python3_EXECUTABLE}" -c "import tensorflow"
+  RESULT_VARIABLE PYTHON_HAS_TENSORFLOW
+  OUTPUT_QUIET
+  ERROR_QUIET
+)
+if(PYTHON_HAS_TENSORFLOW EQUAL 0)
+  add_test(NAME
             HybridNewton
            COMMAND
             ${Python3_EXECUTABLE}
@@ -9,7 +15,7 @@ add_test(NAME
           WORKING_DIRECTORY
             ${PROJECT_BINARY_DIR}/tests/integration/HybridNewton
     )
-if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.22)
+  if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.22)
     set(modifications
         "PYTHONPATH=path_list_append:${opm-common_DIR}/python"
         "PYTHONPATH=path_list_append:${CMAKE_CURRENT_BINARY_DIR}/python"
@@ -19,4 +25,5 @@ if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.22)
                          ENVIRONMENT_MODIFICATION
                            "${modifications}"
     )
+  endif()
 endif()