Cannot click string OPE overlay with empty value

Description

Steps to reproduce:

1. Use a client-side rendering framework to render values of a property (For example, the Music festival site from http://github.com/episerver/musicfestival-vue-template/).
2. Create a Landing page.
3. Try to open 'Title' editor in OPE for inputting value.

Alternate way to reproduce:

1. Edit an existing LandingPage with value in its title property.
2. Clear the value of the title property.
3. Try to edit title again.

Expected:
The floating Title editor is shown for inputting data.

Actual:
Cannot open the Title editor if it has an empty value.