Fix ks-controller panic due to missing nil checking in mutli-branch pipeline

Signed-off-by: rick <rick@jenkins-zh.cn>

pkg/simple/client/devops/jenkins/internal/pull_request.go

@@ -0,0 +1,79 @@
+package internal
+
+type PRDiscoverTrust int
+
+const (
+	PRDiscoverTrustMember     PRDiscoverTrust = 1
+	PRDiscoverTrustEveryone   PRDiscoverTrust = 2
+	PRDiscoverTrustPermission PRDiscoverTrust = 3
+	PRDiscoverTrustNobody     PRDiscoverTrust = 4
+)
+
+type GitHubPRDiscoverTrust int
+
+const (
+	GitHubPRDiscoverTrustContributors GitHubPRDiscoverTrust = 1
+)
+
+func (p PRDiscoverTrust) Value() int {
+	return int(p)
+}
+
+func (p PRDiscoverTrust) String() string {
+	switch p {
+	case PRDiscoverTrustMember:
+		return "TrustMembers"
+	case PRDiscoverTrustEveryone:
+		return "TrustEveryone"
+	case PRDiscoverTrustPermission:
+		return "TrustPermission"
+	case PRDiscoverTrustNobody:
+		return "TrustNobody"
+	}
+	return ""
+}
+
+func (p PRDiscoverTrust) ParseFromString(prTrust string) PRDiscoverTrust {
+	switch prTrust {
+	case "TrustMembers":
+		return PRDiscoverTrustMember
+	case "TrustEveryone":
+		return PRDiscoverTrustEveryone
+	case "TrustPermission":
+		return PRDiscoverTrustPermission
+	case "TrustNobody":
+		return PRDiscoverTrustNobody
+	default:
+		return -1
+	}
+}
+
+func (p GitHubPRDiscoverTrust) Value() int {
+	return int(p)
+}
+
+func (p PRDiscoverTrust) IsValid() bool {
+	return p.String() != ""
+}
+
+func (p GitHubPRDiscoverTrust) String() string {
+	switch p {
+	case GitHubPRDiscoverTrustContributors:
+		return "TrustContributors"
+	default:
+		return PRDiscoverTrust(p).String()
+	}
+}
+
+func (p GitHubPRDiscoverTrust) ParseFromString(prTrust string) GitHubPRDiscoverTrust {
+	switch prTrust {
+	case "TrustContributors":
+		return GitHubPRDiscoverTrustContributors
+	default:
+		return GitHubPRDiscoverTrust(PRDiscoverTrust(p).ParseFromString(prTrust))
+	}
+}
+
+func (p GitHubPRDiscoverTrust) IsValid() bool {
+	return PRDiscoverTrust(p).IsValid()
+}