[fix]Fix issue #2474 #2711

Author: z-song

src/Form/Field/HasMany.php

@@ -133,14 +133,20 @@ public function getValidator(array $input)
         foreach ($rules as $column => $rule) {
             foreach (array_keys($input[$this->column]) as $key) {
                 $newRules["{$this->column}.$key.$column"] = $rule;
-                if (isset($input[$this->column][$key][$column])) {
+                if (isset($input[$this->column][$key][$column]) &&
+                    is_array($input[$this->column][$key][$column]))
+                {
                     foreach ($input[$this->column][$key][$column] as $vkey => $value) {
                         $newInput["{$this->column}.$key.{$column}$vkey"] = $value;
                     }
                 }
             }
         }
 
+        if (empty($newInput)) {
+            $newInput = $input;
+        }
+
         return Validator::make($newInput, $newRules, $this->validationMessages, $attributes);
     }