Tests: Add RunCMake.cmake_path cases for BASE_DIRECTORY missing value

Tests/RunCMake/cmake_path/BASE_DIRECTORY-no-arg-stderr.txt

@@ -0,0 +1,2 @@
+CMake Error at .+/cmake_path/call-cmake_path.cmake:[0-9]+ \(cmake_path\):
+  cmake_path BASE_DIRECTORY requires an argument.

Tests/RunCMake/cmake_path/RunCMakeTest.cmake

@@ -74,6 +74,14 @@ foreach (command IN ITEMS APPEND APPEND_STRING REMOVE_FILENAME REPLACE_FILENAME
 endforeach()
 
 
+## BASE_DIRECTORY without argument
+set (RunCMake-stderr-file "BASE_DIRECTORY-no-arg-stderr.txt")
+
+foreach (command IN ITEMS RELATIVE_PATH ABSOLUTE_PATH)
+  run_cmake_command (${command}-OUTPUT_VARIABLE-no-arg "${CMAKE_COMMAND}" "-DCMAKE_PATH_ARGUMENTS=${command} path BASE_DIRECTORY" -P "${RunCMake_SOURCE_DIR}/call-cmake_path.cmake")
+endforeach()
+
+
 ## Invalid output variable
 set (RunCMake-stderr-file "invalid-output-var-stderr.txt")