Array to string conversion error in $templates->find()

[Toutouwai]

Short description of the issue

Using childTemplates or parentTemplates in $templates->find() causes an array to string conversion error.

Related forum topic: https://processwire.com/talk/topic/28047-how-to-filter-templates-by-selector-childtemplates-solved/

Setup/Environment

• ProcessWire version: 3.0.211

[ryancramerdesign]

Thanks @Toutouwai I've pushed a fix for this.