Improve verification test's error message

[pattyshack]

When chunk verifier returns error, a placeholder signature is generated for that chunk.

[codecov-commenter]

Codecov Report

Merging #3752 (043dc5c) into master (9c5fffa) will decrease coverage by 2.50%.
The diff coverage is n/a.

❗ Current head 043dc5c differs from pull request most recent head c0b3684. Consider uploading reports for the commit c0b3684 to get more accurate results

@@            Coverage Diff             @@
##           master    #3752      +/-   ##
==========================================
- Coverage   55.31%   52.81%   -2.51%     
==========================================
  Files         769       17     -752     
  Lines       70158      943   -69215     
==========================================
- Hits        38808      498   -38310     
+ Misses      28165      391   -27774     
+ Partials     3185       54    -3131     

Flag	Coverage Δ
unittests	52.81% <ø> (-2.51%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/bootstrap/cmd/finalize.go
model/flow/chain.go
storage/badger/my_receipts.go
fvm/transactionInvoker.go
cmd/bootstrap/cmd/name.go
utils/unittest/chain_suite.go
fvm/environment/contract_updater.go
network/p2p/scoring/invalid_peer_id_error.go
engine/verification/requester/qualifier.go
module/signature/signing_tags.go
... and 742 more

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[pattyshack]

bors merge

[bors]

Build succeeded:

• Integration Tests (make -C integration access-tests)
• Integration Tests (make -C integration bft-tests)
• Integration Tests (make -C integration collection-tests)
• Integration Tests (make -C integration consensus-tests)
• Integration Tests (make -C integration epochs-tests)
• Integration Tests (make -C integration execution-tests)
• Integration Tests (make -C integration ghost-tests)
• Integration Tests (make -C integration mvp-tests)
• Integration Tests (make -C integration network-tests)
• Integration Tests (make -C integration verification-tests)
• Lint (./)
• Lint (./crypto/)
• Lint (./integration/)
• Unit Tests (access)
• Unit Tests (admin)
• Unit Tests (cmd)
• Unit Tests (consensus)
• Unit Tests (engine)
• Unit Tests (fvm)
• Unit Tests (ledger)
• Unit Tests (module)
• Unit Tests (network)
• Unit Tests (others)
• Unit Tests (utils)