fix: TypeError: Cannot read property 'joins' of null in case of queryRewrite returns empty query

[paveltiunov]

Check List

• Tests has been run in packages where changes made if available
• Linter has been run for changed code
• Tests for the changes have been added if not covered yet
• Docs have been added / updated if required

[codecov]

Codecov Report

Merging #3627 (e202cf2) into master (8d7ea9b) will decrease coverage by 0.00%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #3627      +/-   ##
==========================================
- Coverage   59.67%   59.67%   -0.01%     
==========================================
  Files         125      125              
  Lines       10014    10021       +7     
  Branches     2266     2270       +4     
==========================================
+ Hits         5976     5980       +4     
+ Misses       3756     3755       -1     
- Partials      282      286       +4     

Impacted Files	Coverage Δ
packages/cubejs-api-gateway/src/query.js	72.80% <57.14%> (-1.03%)	⬇️
packages/cubejs-api-gateway/src/gateway.ts	68.05% <100.00%> (ø)
packages/cubejs-server-core/src/core/server.ts	62.98% <100.00%> (ø)
packages/cubejs-server-core/src/core/DevServer.ts	8.46% <0.00%> (ø)
...kages/cubejs-api-gateway/src/SubscriptionServer.ts	6.77% <0.00%> (ø)
...y-orchestrator/src/orchestrator/PreAggregations.ts	83.88% <0.00%> (ø)

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