Add test of missing verifier in cli context

[antho1404]

Description

When creating a CLI context with no trusted node and no verifier, the /block/xxx is crashing. This PR adds a test to make sure that the verifier is present; if not, it returns an error.

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For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

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For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #5618 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #5618      +/-   ##
==========================================
- Coverage   53.43%   53.42%   -0.01%     
==========================================
  Files         322      322              
  Lines       19748    19750       +2     
==========================================
  Hits        10552    10552              
- Misses       8379     8381       +2     
  Partials      817      817

Impacted Files	Coverage Δ
client/context/query.go	1.86% <0%> (-0.04%)	⬇️

[alexanderbez]

ACK ++