Fix: CLI failes when running with non exsisting file

[andrzej-janczak]

Now:

go run cli-v2.go  analyze --format sarif ./what
❌ Error: cannot find file or directory './what'
exit status 1

Before:

2025/06/11 14:28:37 Failed to merge SARIF outputs: failed to parse SARIF file /tmp/codacy-analysis-2905944739/semgrep.sarif: unexpected end of JSON input

• this PR include it tests update

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.01%	✅ 22.22%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (f97be27)	5419	1420	26.20%
Head commit (745a45e)	5443 (+24)	1426 (+6)	26.20% (-0.01%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#150)	27	6	22.22%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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