BUG: Fix ctest error on ITKExpat linking in GenerateCLP testing

ITKEXPAT is no longer used and has been replaced by ITKExpat which
is now included by setting the project's COMPONENTS. (work by
Hans Johnson in PR #48)

Author: LucasGandel

GenerateCLP/Testing/CLPExample1/CMakeLists.txt

@@ -26,8 +26,9 @@ endif()
 set(${PROJECT_NAME}_SOURCE ${PROJECT_NAME}.cxx)
 GENERATECLP(${PROJECT_NAME}_SOURCE ${PROJECT_NAME}.xml)
 add_executable(${PROJECT_NAME} ${${PROJECT_NAME}_SOURCE})
-target_link_libraries(${PROJECT_NAME} ITKEXPAT ${_additional_link_libraries})
-
+if(_additional_link_libraries)
+  target_link_libraries(${PROJECT_NAME} ${_additional_link_libraries})
+endif()
 #-----------------------------------------------------------------------------
 # Test
 #-----------------------------------------------------------------------------

GenerateCLP/Testing/PointExample1/CMakeLists.txt

@@ -26,4 +26,6 @@ endif()
 set(${PROJECT_NAME}_SOURCE ${PROJECT_NAME}.cxx)
 GENERATECLP(${PROJECT_NAME}_SOURCE ${PROJECT_NAME}.xml)
 add_executable(${PROJECT_NAME} ${${PROJECT_NAME}_SOURCE})
-target_link_libraries(${PROJECT_NAME} ITKEXPAT ${_additional_link_libraries})
+if(_additional_link_libraries)
+  target_link_libraries(${PROJECT_NAME} ${_additional_link_libraries})
+endif()

GenerateCLP/Testing/Slicer3Example/CMakeLists.txt

@@ -26,7 +26,9 @@ endif()
 set(${PROJECT_NAME}_SOURCE ${PROJECT_NAME}.cxx)
 GENERATECLP(${PROJECT_NAME}_SOURCE ${PROJECT_NAME}.xml)
 add_executable(${PROJECT_NAME} ${${PROJECT_NAME}_SOURCE})
-target_link_libraries(${PROJECT_NAME} ITKEXPAT ${_additional_link_libraries})
+if(_additional_link_libraries)
+  target_link_libraries(${PROJECT_NAME} ${_additional_link_libraries})
+endif()
 
 #-----------------------------------------------------------------------------
 # Test