elementary: Check for valid frame object

Summary:
Make sure we have a valid frame object before calling edje & evas
functions on it. This patch fixes an issue where NULL is being passed
to eo functions

ref T7030

Reviewers: zmike

Reviewed By: zmike

Subscribers: cedric, committers

Tags: efl

Maniphest Tasks: T7030

Differential Revision: https://phab.enlightenment.org/D6637