[#1709] Add info for when there are zero search results

[jiromaykin]

https://taiga.maykinmedia.nl/project/open-inwoner/task/1709

[Bartvaderkin]

@jiromaykin This should be fixed now, it was more work because the search feedback tests depended on the fixed functionality and I had to figure out more about how the search works to get that cleaned up.

Also I had to rebase because of a merge conflict.

[Bartvaderkin]

Does this/these spaceless tags around a single tag actually do anything? I see similar on line 75 but it looks strange, like there would still be space before/after the template tags?

[jiromaykin]

@Bartvaderkin Ah yes, I thought it was a styling tag, but it's not. Spaceless tag is a standard Django template tag, used because newlines/spaces in templates behave like a character. Only whitespaces between successive opening HTML tags and successive closing tags are removed, so not effective for single elements.

[codecov-commenter]

Codecov Report

Merging #758 (c79971d) into develop (defa012) will decrease coverage by 0.02%.
The diff coverage is 8.51%.

❗ Current head c79971d differs from pull request most recent head 4d40316. Consider uploading reports for the commit 4d40316 to get more accurate results

@@             Coverage Diff             @@
##           develop     #758      +/-   ##
===========================================
- Coverage    93.58%   93.56%   -0.02%     
===========================================
  Files          697      697              
  Lines        24595    24598       +3     
===========================================
  Hits         23016    23016              
- Misses        1579     1582       +3     

Files Changed	Coverage Δ
src/open_inwoner/search/tests/test_page.py	19.73% <0.00%> (ø)
src/open_inwoner/search/tests/test_feedback.py	17.05% <7.14%> (-0.55%)	⬇️
src/open_inwoner/search/views.py	56.04% <100.00%> (+0.60%)	⬆️

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