Avoid displaying empty type field in search result list

[osma]

This PR avoids showing an empty type field in search result list. This could happen for concepts which had only skos:Concept as their type.

Before:

After:

This isn't quite what @tfrancart requested in #942:

I would expect to see "Concept" as the value for "Concept type".

Instead, this makes the search result list match the concept page, where a type field is not shown at all if "Concept" is the only type of a concept.

The Twig template code for this part of the search result list was simplified a lot. It had a lot of unnecessary complexity as it was adapted from the concept page in commit 89a02e2

Fixes #942

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Merging #973 into master will increase coverage by 0.30%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #973      +/-   ##
============================================
+ Coverage     58.79%   59.09%   +0.30%     
- Complexity     1505     1562      +57     
============================================
  Files            32       32              
  Lines          4208     4440     +232     
============================================
+ Hits           2474     2624     +150     
- Misses         1734     1816      +82     

Impacted Files	Coverage Δ	Complexity Δ
controller/WebController.php	17.95% <0.00%> (+0.19%)	95.00% <0.00%> (ø%)
model/VocabularyConfig.php	94.33% <0.00%> (+2.03%)	132.00% <0.00%> (+57.00%)

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[joelit]

Looks even better than expected.