Don't call get_pr_data if GitLeaks linter is not active

[bdovaz]

If you have REPOSITORY_GITLEAKS_PR_COMMITS_SCAN: true but the linter is not enabled it will fail:

https://github.com/oxsecurity/megalinter/blob/2402a653f4d13b4a4be7b0ab2df3b5b9fa325d7e/megalinter/linters/GitleaksLinter.py

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/megalinter/run.py", line 11, in <module>
    linter = megalinter.Megalinter({"cli": True, "request_id": str(uuid.uuid1())})
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/megalinter/MegaLinter.py", line 185, in __init__
    self.load_linters()
  File "/megalinter/MegaLinter.py", line 612, in load_linters
    all_linters = linter_factory.list_all_linters(linter_init_params)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/megalinter/linter_factory.py", line 30, in list_all_linters
    descriptor_linters = build_descriptor_linters(
                         ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/megalinter/linter_factory.py", line 117, in build_descriptor_linters
    linter_instance = linter_class(linter_init_params, instance_attributes)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/megalinter/linters/GitleaksLinter.py", line 19, in __init__
    self.pr_source_sha, self.pr_target_sha = self.get_pr_data()
                                             ^^^^^^^^^^^^^^^^^^
  File "/megalinter/linters/GitleaksLinter.py", line 40, in get_pr_data
    pr_target_sha = self.get_azure_devops_pr_target_sha(
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/megalinter/linters/GitleaksLinter.py", line 67, in get_azure_devops_pr_target_sha
    repo = utils.git.Repo(os.path.realpath(self.workspace))
                                           ^^^^^^^^^^^^^^
AttributeError: 'GitleaksLinter' object has no attribute 'workspace'

This happens because if the linter is not active, the workspace variable is not assigned:

megalinter/megalinter/Linter.py

Line 274 in 2402a65

self.workspace = params["workspace"] if "workspace" in params else "."

I therefore propose that you do nothing if it is deactivated.

[github-actions]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ API	spectral	1		0	1.77s
⚠️ BASH	bash-exec	6		1	0.02s
✅ BASH	shellcheck	6		0	0.21s
✅ BASH	shfmt	6	0	0	0.84s
✅ COPYPASTE	jscpd	yes		no	3.4s
✅ DOCKERFILE	hadolint	129		0	23.87s
✅ JSON	jsonlint	20		0	0.25s
✅ JSON	v8r	22		0	16.49s
⚠️ MARKDOWN	markdownlint	267	0	301	27.93s
✅ MARKDOWN	markdown-table-formatter	267	0	0	159.85s
⚠️ PYTHON	bandit	214		66	3.5s
✅ PYTHON	black	214	0	0	5.49s
✅ PYTHON	flake8	214		0	2.05s
✅ PYTHON	isort	214	0	0	1.18s
✅ PYTHON	mypy	214		0	18.58s
✅ PYTHON	pylint	214		0	34.22s
✅ PYTHON	ruff	214	0	0	0.78s
✅ REPOSITORY	checkov	yes		no	36.44s
✅ REPOSITORY	git_diff	yes		no	1.32s
⚠️ REPOSITORY	grype	yes		26	15.61s
✅ REPOSITORY	secretlint	yes		no	11.82s
✅ REPOSITORY	trivy	yes		no	16.51s
✅ REPOSITORY	trivy-sbom	yes		no	0.28s
⚠️ REPOSITORY	trufflehog	yes		1	53.21s
✅ SPELL	cspell	717		0	13.97s
⚠️ SPELL	lychee	349		13	6.05s
✅ XML	xmllint	3	0	0	0.81s
✅ YAML	prettier	160	0	0	5.03s
✅ YAML	v8r	102		0	34.04s
✅ YAML	yamllint	161		0	2.98s

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