Add nil check when checking setup software (#30520)

Quick nil check + test to check that it works. Test fails with panic on
main, works on this branch.

cmd/fleetctl/fleetctl/generate_gitops.go

@@ -926,7 +926,8 @@ func (cmd *GenerateGitopsCommand) generateControls(teamId *uint, teamName string
 			}
 			hasSetupSoftware := false
 			for _, software := range setupSoftware {
-				if software.SoftwarePackage.InstallDuringSetup != nil && *software.SoftwarePackage.InstallDuringSetup {
+				pkg := software.SoftwarePackage
+				if pkg != nil && pkg.InstallDuringSetup != nil && *pkg.InstallDuringSetup {
 					hasSetupSoftware = true
 					break
 				}

cmd/fleetctl/fleetctl/generate_gitops_test.go

@@ -420,6 +420,11 @@ func (MockClient) GetSetupExperienceSoftware(teamID uint) ([]fleet.SoftwareTitle
 					Version:            "13.37",
 				},
 			},
+			{
+				ID:         2,
+				Name:       "My Other Software Package",
+				HashSHA256: ptr.String("software-package-hash"),
+			},
 		}, nil
 	}
 	if teamID == 0 || teamID == 3 || teamID == 4 || teamID == 5 {