fix(openchallenges): display zero search results

[rrchai]

• fixes #2468

Changelog

• not display "Results (N)" when page initially load (when its value is undefined)
• display "Results (0)" if the no search results found.

Preview

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[!NOTE] The changes in this pr will not reintroduce the flickering:

[sonarcloud[bot]]

Quality Gate passed for 'openchallenges-app'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[sonarcloud[bot]]

Quality Gate passed for 'openchallenges-challenge-service'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.5% Duplication on New Code

See analysis details on SonarCloud

[sonarcloud[bot]]

Quality Gate passed for 'openchallenges-organization-service'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[sonarcloud[bot]]

Quality Gate passed for 'openchallenges-image-service'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[tschaffter]

@rrchai The flickering is back for me. This happens when reaching the page directly from another website or reloading the page but not when navigating between pages. Can you reproduce this flickering.

[rrchai]

Interesting, the flickering is not reproduced on my end.

I wonder if this flickering (from reloading the page) occurred before this PR was implemented on your end?

[tschaffter]

You are right, the flickering is already present on the production site (https://openchallenges.io/challenge). So we never got rid of it...