IsFileExists fix #2

Job	Run time
Pretest	3m 11s
Bitbucket Server Integration Tests	1m 5s
Azure Integration Tests (ubuntu)	57s
GitHub Integration Tests	49s
Azure Integration Tests (windows)	3m 37s
GitLab Integration Tests (ubuntu)	51s
Azure Integration Tests (macos)	56s
GitLab Integration Tests (windows)	3m 57s
GitLab Integration Tests (macos)	53s
Unit Tests (ubuntu)	2m 13s
Unit Tests (windows)	7m 51s
Unit Tests (macos)	4m 35s
Scan Repository Tests (ubuntu)	1m 36s
Scan Repository Tests (windows)	7m 2s
Scan Repository Tests (macos)	1m 35s
Scan Pull Request Tests (ubuntu)	1m 25s
Scan Pull Request Tests (windows)	6m 34s
Scan Pull Request Tests (macos)	1m 47s
Package Handlers Tests (ubuntu)	6m 9s
Package Handlers Tests (windows)	9m 12s
Package Handlers Tests (macos)	4m 19s
	1h 10m 34s

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