fix: show proper empty screen when no contacts [WPB-250]

[github-actions]

WPB-250 Implement empty state for contact list

Cherry pick from the original PR:

• fix: show proper empty screen when no contacts [WPB-250] #2141

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⚠️ Conflicts during cherry-pick:

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PR Submission Checklist for internal contributors

• The PR Title

  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • contains a reference JIRA issue number like SQPIT-764
  • answers the question: If merged, this PR will: ... ³

• The PR Description

  • is free of optional paragraphs and you have filled the relevant parts to the best of your ability

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What's new in this PR?

Issues

When user does not have any contacts, he/she sees an empty screen when creating new conversation and can easily get confused because of that.

Solutions

Add proper empty screen according to the design documentation and fix returning EmptyResult when there are no contacts.

Testing

Test Coverage (Optional)

• I have added automated test to this contribution

How to Test

Log in to a personal account which does not yet have any contacts.

Attachments (Optional)

Before	After

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PR Post Submission Checklist for internal contributors (Optional)

• Wire's Github Workflow has automatically linked the PR to a JIRA issue

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PR Post Merge Checklist for internal contributors

• If any soft of configuration variable was introduced by this PR, it has been added to the relevant documents and the CI jobs have been updated.

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References

1. https://sparkbox.com/foundry/semantic_commit_messages
2. https://github.com/wireapp/.github#usage
3. E.g. feat(conversation-list): Sort conversations by most emojis in the title #SQPIT-764.

[codecov]

Codecov Report

Merging #2175 (7c8b64c) into develop (780f878) will increase coverage by 0.01%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #2175      +/-   ##
=============================================
+ Coverage      40.95%   40.97%   +0.01%     
- Complexity       994      995       +1     
=============================================
  Files            310      310              
  Lines          11386    11386              
  Branches        1518     1518              
=============================================
+ Hits            4663     4665       +2     
+ Misses          6283     6281       -2     
  Partials         440      440              

Files Changed	Coverage Δ
...home/conversations/search/SearchPeopleViewModel.kt	69.56% <ø> (+0.86%)	⬆️

... and 1 file with indirect coverage changes

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[github-actions]

Test Results

599 tests  +3   598 ✔️ +3   4m 41s ⏱️ - 3m 13s
  85 suites ±0       1 💤 ±0 
  85 files   ±0       0 ❌ ±0 

Results for commit 7c8b64c. ± Comparison against base commit 780f878.

[github-actions]

APKs built during tests are available here. Scroll down to Artifacts!

[AndroidBob]

Build 521 succeeded.

The build produced the following APK's:

• com.wire.android-v4.5.0(7487643)(7487643)-staging-compat.apk