Plugin: Zoom: Check if plugin is installed before create JWTClient

public/plugin/zoom/lib/ZoomPlugin.php

@@ -78,8 +78,11 @@ class ZoomPlugin extends Plugin
         );
 
         $this->isAdminPlugin = true;
+
+        if ($this->isEnabled(true)) {
             $this->jwtClient = new JWTClient($this->get('apiKey'), $this->get('apiSecret'));
         }
+    }
 
     /**
      * Caches and returns an instance of this class.