Merge branch 'hotfix/48' into develop

Forward port #48

Author: weierophinney

src/ArrayInput.php

@@ -86,7 +86,7 @@ public function isValid($context = null)
                 $result = true;
                 continue;
             }
-            if ($empty && $this->isRequired() && $this->allowEmpty() && !$this->continueIfEmpty()) {
+            if ($empty && $this->allowEmpty() && !$this->continueIfEmpty()) {
                 $result = true;
                 continue;
             }

src/FileInput.php

@@ -132,7 +132,7 @@ public function isValid($context = null)
             return true;
         }
 
-        if ($empty && $required && $allowEmpty && ! $continueIfEmpty) {
+        if ($empty && $allowEmpty && ! $continueIfEmpty) {
             return true;
         }
 

src/Input.php

@@ -411,7 +411,7 @@ public function isValid($context = null)
             return true;
         }
 
-        if ($empty && $required && $allowEmpty && ! $continueIfEmpty) {
+        if ($empty && $allowEmpty && ! $continueIfEmpty) {
             return true;
         }