fix(sdk): handle empty message and helpUri in SARIF output

Ensure result message.text is never empty (falls back to CheckTitle)
and omit helpUri when RelatedUrl is empty to avoid SARIF validation
warnings.

prowler/lib/outputs/sarif/sarif.py

@@ -41,15 +41,17 @@ class SARIF(Output):
             severity = finding.metadata.Severity.lower()
 
             if check_id not in rules:
-                rules[check_id] = {
+                rule = {
                     "id": check_id,
                     "name": check_id,
                     "shortDescription": {"text": finding.metadata.CheckTitle},
-                    "fullDescription": {"text": finding.metadata.Description},
-                    "helpUri": finding.metadata.RelatedUrl or "",
+                    "fullDescription": {
+                        "text": finding.metadata.Description or check_id
+                    },
                     "help": {
                         "text": finding.metadata.Remediation.Recommendation.Text
-                        or finding.metadata.Description,
+                        or finding.metadata.Description
+                        or check_id,
                     },
                     "defaultConfiguration": {
                         "level": SEVERITY_TO_SARIF_LEVEL.get(severity, "note"),
@@ -65,13 +67,18 @@ class SARIF(Output):
                         ),
                     },
                 }
+                if finding.metadata.RelatedUrl:
+                    rule["helpUri"] = finding.metadata.RelatedUrl
+                rules[check_id] = rule
 
             rule_index = list(rules.keys()).index(check_id)
             result = {
                 "ruleId": check_id,
                 "ruleIndex": rule_index,
                 "level": SEVERITY_TO_SARIF_LEVEL.get(severity, "note"),
-                "message": {"text": finding.status_extended},
+                "message": {
+                    "text": finding.status_extended or finding.metadata.CheckTitle
+                },
             }
 
             location = self._build_location(finding)

tests/lib/outputs/sarif/sarif_test.py

@@ -221,7 +221,6 @@ class TestSARIF:
         assert "id" in rule
         assert "shortDescription" in rule
         assert "fullDescription" in rule
-        assert "helpUri" in rule
         assert "help" in rule
         assert "defaultConfiguration" in rule
         assert "properties" in rule