fix(entities): enum map throws exception for empty maps

[skjindal93]

No description provided.

[github-actions]

Test Results

366 tests  ±0   366 ✅ ±0   9s ⏱️ ±0s
 67 suites ±0     0 💤 ±0 
 67 files   ±0     0 ❌ ±0 

Results for commit 87615bf. ± Comparison against base commit c595ac6.

This pull request removes 17 and adds 2 tests. Note that renamed tests count towards both.

      long: 60
      string: "PT1M"
      valueType: LONG
      valueType: STRING
    alias: "numCalls"
    columnName: "SERVICE.numCalls"
    value {
    }
  columnIdentifier {
…

org.hypertrace.gateway.service.baseline.BaselineServiceImplTest ‑ [1] function: AVGRATE
arguments {
  columnIdentifier {
    columnName: "SERVICE.numCalls"
    alias: "numCalls"
  }
}
arguments {
  literal {
    value {
      valueType: STRING
      string: "PT1M"
    }
  }
}
alias: "numCalls"

org.hypertrace.gateway.service.baseline.BaselineServiceImplTest ‑ [2] function: AVGRATE
arguments {
  columnIdentifier {
    columnName: "SERVICE.numCalls"
    alias: "numCalls"
  }
}
arguments {
  literal {
    value {
      valueType: LONG
      long: 60
    }
  }
}
alias: "numCalls"

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 81.35%. Comparing base (c595ac6) to head (87615bf).

Files	Patch %	Lines
...way/service/entity/query/ExecutionTreeBuilder.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #195   +/-   ##
=========================================
  Coverage     81.35%   81.35%           
  Complexity     1371     1371           
=========================================
  Files           126      126           
  Lines          6200     6200           
  Branches        524      524           
=========================================
  Hits           5044     5044           
  Misses          897      897           
  Partials        259      259           

Flag	Coverage Δ
unit	81.35% <0.00%> (ø)

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