BUG: don't fail with FATAL_ERROR if REQUIRED was not used

Alex

Modules/FindVTK.cmake

@@ -130,11 +130,11 @@ IF(VTK_FOUND)
   SET(USE_VTK_FILE ${VTK_USE_FILE})
 ELSE(VTK_FOUND)
   # VTK not found, explain to the user how to specify its location.
-  IF(NOT VTK_FIND_QUIETLY)
+  IF(VTK_FIND_REQUIRED)
     MESSAGE(FATAL_ERROR ${VTK_DIR_MESSAGE})
-  ELSE(NOT VTK_FIND_QUIETLY)
-    IF(VTK_FIND_REQUIRED)
-      MESSAGE(FATAL_ERROR ${VTK_DIR_MESSAGE})
-    ENDIF(VTK_FIND_REQUIRED)
-  ENDIF(NOT VTK_FIND_QUIETLY)
+  ELSE(VTK_FIND_REQUIRED)
+    IF(NOT VTK_FIND_QUIETLY)
+      MESSAGE(STATUS ${VTK_DIR_MESSAGE})
+    ENDIF(NOT VTK_FIND_QUIETLY)
+  ENDIF(VTK_FIND_REQUIRED)
 ENDIF(VTK_FOUND)