ERR: Dummy InitialPass implementation must return a value.

Source/cmEndForEachCommand.h

@@ -46,7 +46,7 @@ public:
    * This is called when the command is first encountered in
    * the CMakeLists.txt file.
    */
-  virtual bool InitialPass(std::vector<std::string> const&) {}
+  virtual bool InitialPass(std::vector<std::string> const&) {return false;}
 
   /**
    * This determines if the command gets propagated down