early returns to avoid long code in if / else

early returns to avoid long code in if / else

Instead of enclosing a lot of code in a if() {} block. I reverted the logic
to exit early. That makes code a bit easier to read.

Logic was:
 if( $title->getNamespace() >= 0 && !$accErrors && $newid ) {
   // LOT OF CODE
 }
 return;

Now:
 if( $title->getNamespace() < 0 || $accErrors || !$newid ) {
   return;
 }
 // LOT OF CODE