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_test.go

@@ -0,0 +1,28 @@
+package internal
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestPRDiscoverTrust(t *testing.T) {
+	assert.Equal(t, PRDiscoverTrust(1).String(), "TrustMembers")
+	assert.Equal(t, PRDiscoverTrust(2).String(), "TrustEveryone")
+	assert.Equal(t, PRDiscoverTrust(3).String(), "TrustPermission")
+	assert.Equal(t, PRDiscoverTrust(4).String(), "TrustNobody")
+	assert.Equal(t, PRDiscoverTrust(-1).IsValid(), false)
+	assert.Equal(t, PRDiscoverTrust(1).Value(), 1)
+
+	assert.Equal(t, PRDiscoverTrust(1).ParseFromString("TrustMembers"), PRDiscoverTrustMember)
+	assert.Equal(t, PRDiscoverTrust(1).ParseFromString("TrustEveryone"), PRDiscoverTrustEveryone)
+	assert.Equal(t, PRDiscoverTrust(1).ParseFromString("TrustPermission"), PRDiscoverTrustPermission)
+	assert.Equal(t, PRDiscoverTrust(1).ParseFromString("TrustNobody"), PRDiscoverTrustNobody)
+	assert.Equal(t, PRDiscoverTrust(1).ParseFromString("fake").IsValid(), false)
+
+	assert.Equal(t, GitHubPRDiscoverTrust(1).String(), "TrustContributors")
+	assert.Equal(t, GitHubPRDiscoverTrust(2).String(), PRDiscoverTrust(2).String())
+	assert.Equal(t, GitHubPRDiscoverTrust(1).Value(), 1)
+	assert.Equal(t, GitHubPRDiscoverTrust(1).ParseFromString("TrustContributors"), GitHubPRDiscoverTrustContributors)
+	assert.Equal(t, GitHubPRDiscoverTrust(1).ParseFromString("TrustEveryone").String(), "TrustEveryone")
+	assert.Equal(t, GitHubPRDiscoverTrust(1).ParseFromString("fake").IsValid(), false)
+}