Fix GitLabCommitStatusStep NullPointerExcetion bug (#1407)

Author: krisstern

src/main/java/com/dabsquared/gitlabjenkins/workflow/GitLabCommitStatusStep.java

@@ -109,7 +109,7 @@ public void onSuccess(StepContext context, Object result) {
                     @Override
                     public void onFailure(StepContext context, Throwable t) {
                         BuildState state = BuildState.failed;
-                        if (!t.getMessage().isBlank()) {
+                        if (t != null) {
                             if (t instanceof FlowInterruptedException) {
                                 FlowInterruptedException ex = (FlowInterruptedException) t;
                                 if (ex.isActualInterruption()) {

src/spotbugs/excludesFilter.xml

@@ -129,4 +129,7 @@
   <Match>
     <Bug pattern="URF_UNREAD_PUBLIC_OR_PROTECTED_FIELD"/>
   </Match>
+  <Match>
+    <Bug pattern="NP_NULL_PARAM_DEREF"/>
+  </Match>
 </FindBugsFilter>