Description:
* **Operating System:** Windows 10, 64-bit build 1607. 
* **LibreOffice version:** 6.1.4.2 (current install); 6.2.0.3 (removed) 
* **[Screenshot of Problem on 6.1.4](https://i.imgur.com/VdlXRA1.png)** 

I installed LibreOffice 6.2. However, I noticed it removed my solid gray theme, which is easy on my eyes. It was replaced with the ugly, pasty white default gradient. "OK", I thought. "The theme was probably removed because the whole themes engine was reworked." I look for the solid gray theme to re-install it, and ALL searches through ALL categories return "no results". I tried other search terms, generic search terms -- no results. I think the new Theme menu is broken.

I decided to re-install the old version I had before. But now, my new (previous) install of 6.1.4 won't even fetch the themes, returning the same "no results" error. Now my LO is stuck with this ugly pasty gradient that clashes with my light gray background scheme. It's awful, I want my solid gray theme back.

I've installed 6.1.5 and have the same "no results" error too. 


Steps to Reproduce:
1. Search for any custom theme in 6.1.5+ or 6.2+ in the "Personalization" dialog box. (Options ---> LibreOffice ---> Personalization ---> Own Theme ---> Select Theme) 
2. The dialog box will return "no results found". 
3. The default theme is LibreOffice. 

Actual Results:
No results were found, despite using both generic and specific search terms, wild cards, and else. 

Expected Results:
The dialog box should've returned results for "classic gray" or "classic grey" and other themes, depending on the exact search string. 


Reproducible: Always


User Profile Reset: No



Additional Info:
[Information automatically included from LibreOffice]
Locale: en-US
Module: TextDocument
[Information guessed from browser]
OS: Windows 10, 64-bit, build 1607 (All)
OS is 64bit: Yes 

Version: 6.1.5.2 (x64)
Build ID: 90f8dcf33c87b3705e78202e3df5142b201bd805
CPU threads: 4; OS: Windows 10.0; UI render: default; 
Locale: en-CA (en_CA); Calc: group threaded