Console Classes dump fix. It was running aground on having a case where there was a empty value for the 'usage' field in the class header. This would break the allocation because we're allocating nothing. This rejects it if the usage field is an empty string.

Engine/source/console/consoleDoc.cpp

@@ -85,7 +85,7 @@ void printClassHeader(const char* usage, const char * className, const char * su
       Con::printf("///       information was available for this class.");
    }
 
-   if( usage != NULL )
+   if( usage != NULL && usage != "")
    {
       // Copy Usage Document
       S32 usageLen = dStrlen( usage );