Fix getWithout should always return array.

Author: sfadschm

src/Traits/ModelTrait.php

@@ -104,7 +104,19 @@ protected function getWith(): array
 	 */
 	protected function getWithout(): array
 	{
-		return empty($this->without) ? [] : $this->without;
+		// Ensure $this->without is set at all
+		if (empty($this->without))
+		{
+			$this->without = [];
+		}
+		
+		// Force a single table name into an array
+		if (! is_array($this->without))
+		{
+			$this->without = [$this->without];
+		}
+
+		return $this->without;
 	}
 
 	/**