Fix resolve common ancestor hash when revision not found #3269

Job	Run time
Pretest	1m 0s
Pretest	1m 0s
GitLab Integration Tests (ubuntu)	7m 31s
GitLab Integration Tests (ubuntu)	7m 31s
Azure Integration Tests (ubuntu)	2m 57s
Azure Integration Tests (ubuntu)	4m 32s
GitLab Integration Tests (windows)	9m 12s
GitLab Integration Tests (windows)	9m 12s
Azure Integration Tests (windows)	8m 49s
Azure Integration Tests (windows)	8m 49s
Bitbucket Server Integration Tests	6m 17s
Bitbucket Server Integration Tests	6m 17s
GitLab Integration Tests (macos)	8m 50s
GitLab Integration Tests (macos)	8m 50s
Azure Integration Tests (macos)	6m 6s
Azure Integration Tests (macos)	6m 6s
GitHub Integration Tests	5m 12s
GitHub Integration Tests	5m 12s
Unit Tests (ubuntu)	2m 35s
Unit Tests (ubuntu)	2m 35s
Unit Tests (windows)	9m 35s
Unit Tests (windows)	9m 35s
Unit Tests (macos)	2m 22s
Unit Tests (macos)	2m 22s
Scan Repository Tests (ubuntu)	12m 25s
Scan Repository Tests (ubuntu)	13m 49s
Scan Repository Tests (windows)	27m 45s
Scan Repository Tests (windows)	27m 45s
Scan Repository Tests (macos)	18m 10s
Scan Repository Tests (macos)	18m 10s
Scan Pull Request Tests (ubuntu)	16m 15s
Scan Pull Request Tests (ubuntu)	16m 15s
Scan Pull Request Tests (windows)	26m 30s
Scan Pull Request Tests (windows)	26m 30s
Scan Pull Request Tests (macos)	22m 29s
Scan Pull Request Tests (macos)	22m 29s
Package Handlers Tests (ubuntu)	4m 3s
Package Handlers Tests (ubuntu)	4m 3s
Package Handlers Tests (windows)	15m 14s
Package Handlers Tests (windows)	15m 14s
Package Handlers Tests (macos)	5m 41s
Package Handlers Tests (macos)	5m 41s
	7h 20m 55s

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