$groups is never empty

src/Finder/Finder.php

@@ -248,24 +248,22 @@ private function buildIterator($path)
 			$iterator->setMaxDepth($this->maxDepth);
 		}
 
-		if ($this->groups) {
-			$groups = $this->groups;
-			$iterator = new CallbackFilterIterator($iterator, function ($foo, $bar, CallbackFilterIterator $file) use ($groups) {
-				do {
-					$file = $file->getInnerIterator();
-				} while (!$file instanceof RecursiveDirectoryIterator);
-
-				foreach ($groups as $filters) {
-					foreach ($filters as $filter) {
-						if (!call_user_func($filter, $file)) {
-							continue 2;
-						}
+		$groups = $this->groups;
+		$iterator = new CallbackFilterIterator($iterator, function ($foo, $bar, CallbackFilterIterator $file) use ($groups) {
+			do {
+				$file = $file->getInnerIterator();
+			} while (!$file instanceof RecursiveDirectoryIterator);
+
+			foreach ($groups as $filters) {
+				foreach ($filters as $filter) {
+					if (!call_user_func($filter, $file)) {
+						continue 2;
 					}
-					return TRUE;
 				}
-				return FALSE;
-			});
-		}
+				return TRUE;
+			}
+			return FALSE;
+		});
 
 		return $iterator;
 	}