Use parent pom 4.77

pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <groupId>org.jenkins-ci.plugins</groupId>
         <artifactId>plugin</artifactId>
-        <version>4.76</version>
+        <version>4.77</version>
         <relativePath />
     </parent>
 

src/main/java/hudson/plugins/copyartifact/CopyArtifact.java

@@ -379,10 +379,17 @@
         if (isUpgradeNeeded()) {
             Jenkins jenkins = Jenkins.getInstanceOrNull();
             if (jenkins == null) {
-                LOGGER.log(Level.SEVERE, "upgrading copyartifact is required for {0} but Jenkins instance is unavailable", job.getDisplayName());
+                LOGGER.log(Level.SEVERE, "Upgrading copyartifact is required for {0} but Jenkins instance is unavailable", job.getDisplayName());
                 return false;
             }
-            int i = projectName.lastIndexOf('/');
+
+            int i;
+            if (projectName != null) {
+                i = projectName.lastIndexOf('/');
+            } else {
+                throw new IllegalArgumentException("projectName cannot be null");
+            }
+
             if (i != -1 && projectName.indexOf('=', i) != -1 && /* not matrix */jenkins.getItem(projectName, job.getParent(), Job.class) == null) {
                 project = projectName.substring(0, i);
                 parameters = projectName.substring(i + 1);