Add an empty view for blog posts

[enisn]

Description

Resolves #18765

Part of https://github.com/volosoft/vs-internal/issues/3588

When there is no blog post in the blog index, the following message will be rendered:

Checklist

• I fully tested it as developer / designer and created unit / integration tests
• I documented it (or no need to document or I will create a separate documentation issue)

How to test it?

Please describe how this can be tested by the test engineers if it is not already explicit - or remove this section if no need to description.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (211599f) 51.57% compared to head (ed3ada8) 51.59%.
Report is 14 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #18780      +/-   ##
==========================================
+ Coverage   51.57%   51.59%   +0.02%     
==========================================
  Files        3079     3079              
  Lines       97579    97658      +79     
  Branches     7788     7792       +4     
==========================================
+ Hits        50327    50391      +64     
- Misses      45705    45720      +15     
  Partials     1547     1547              

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