In existent macro parameter type class causes macro to be invisble from the macro picker

If the "parameter type" of an WikiMacroParameterClass object contains an undefined java.lang class (like wrong case or in existent class), the macro is no longer available to the users (like in CKEditor via the cog) and no longer functions if already or manually defined.

Unlike if a non-sense class is supplied, like java.lang.Void, which is probably converted to java.lang String. So it might be an option to do the same for in existing java.lang types?