spotted when exploring a bugsplat

Not convinced this will stop the splat but it seems like a safer option.

indra/newview/animationexplorer.cpp

@@ -182,6 +182,7 @@ BOOL AnimationExplorer::postBuild()
     else
     {
         LL_WARNS("AnimationExplorer") << "Could not find animation preview control to place animation texture" << LL_ENDL;
+        return FALSE;
     }
 
     // request list of recent animations