Update PostgresGrammar.php

Author: urusaich

src/Illuminate/Database/Query/Grammars/PostgresGrammar.php

@@ -81,6 +81,20 @@ public function compileInsertGetId(Builder $query, $values, $sequence)
 
         return $this->compileInsert($query, $values).' returning '.$this->wrap($sequence);
     }
+    
+    /**
+     * @inheritdoc
+     */
+    public function compileInsert(Builder $query, array $values)
+    {
+        $table = $this->wrapTable($query->from);
+
+        if (empty($values)) {
+            return "insert into $table DEFAULT VALUES";
+        }
+
+        return parent::compileInsert($query, $values);
+    }
 
     /**
      * Compile an update statement into SQL.