inlineMode suggestion doesn't appear unless SearchTextField placeholder has value

[heinst]

I ran into the issue where unless placeholder is set to at least " " the suggestions will not show up. This is not how I would expect the library to function.

Steps to reproduce

1. Create a new SearchTextField and set inlineMode = true and the filterStrings
2. Run the app and type in a search, notice no results show up
3. Run the app again setting the first steps placeholder to have some arbitrary value
4. Notice results now show