Default result if OEmbed::providerEmbedInDomIsBroken() is called with an invalid class

Author: Dave Ross

src/Providers/OEmbed.php

@@ -269,5 +269,8 @@ protected static function providerEmbedInDomIsBroken(Request $request) {
         if ( class_exists( $class ) && $request->match( $class::getPatterns() ) ) {
             return $class::embedInDomIsBroken();
         }
+
+        // Fall-through default in case this called for an invalid class
+        return false;
     }
 }