update secureWorkflow

Author: Devils-Knight

remediation/workflow/permissions/permissions.go

@@ -101,6 +101,9 @@ func AddWorkflowLevelPermissions(inputYaml string, addProjectComment bool) (stri
 	line := 0
 	column := 0
 	topNode := t.Content
+	if len(topNode) == 0 {
+		return inputYaml, fmt.Errorf("Workflow file provided is Empty")
+	}
 	for _, n := range topNode[0].Content {
 		if n.Value == "jobs" && n.Tag == "!!str" {
 			line = n.Line

remediation/workflow/secureworkflow_test.go

@@ -120,6 +120,7 @@ func TestSecureWorkflow(t *testing.T) {
 		{fileName: "nopin.yml", wantPinnedActions: false, wantAddedHardenRunner: true, wantAddedPermissions: true},
 		{fileName: "allperms.yml", wantPinnedActions: false, wantAddedHardenRunner: false, wantAddedPermissions: true},
 		{fileName: "multiplejobperms.yml", wantPinnedActions: false, wantAddedHardenRunner: false, wantAddedPermissions: true},
+		{fileName: "error.yml", wantPinnedActions: false, wantAddedHardenRunner: false, wantAddedPermissions: false},
 	}
 	for _, test := range tests {
 		input, err := ioutil.ReadFile(path.Join(inputDirectory, test.fileName))