Merge pull request #265 from ElijahLynn/fix-coverage-rootcomposer

Use empty() instead of isset() to check for empty arrays in RootComposer (test coverage 100%)

Author: cweagans

src/Resolvers/RootComposer.php

@@ -22,7 +22,7 @@ public function resolve(PatchCollection $collection, PackageEvent $event)
 
         $extra = $this->composer->getPackage()->getExtra();
 
-        if (!isset($extra['patches'])) {
+        if (empty($extra['patches'])) {
             return;
         }