[JENKINS-62710] Ignore arithmetic exception in helper message

The printCommitMessageToLog method is a convenience for readers of the
build log.  Failures in printCommitMessageToLog should not fail the build.

src/main/java/hudson/plugins/git/GitSCM.java

@@ -1233,7 +1233,11 @@ public void checkout(Run<?, ?> build, Launcher launcher, FilePath workspace, Tas
         // Needs to be after the checkout so that revToBuild is in the workspace
         try {
             printCommitMessageToLog(listener, git, revToBuild);
-        } catch (GitException ge) {
+        } catch (ArithmeticException | GitException ge) {
+            // JENKINS-45729 reports a git exception when revToBuild cannot be found in the workspace.
+            // JENKINS-46628 reports a git exception when revToBuild cannot be found in the workspace.
+            // JENKINS-62710 reports a JGit arithmetic exception on an older Java 8 system.
+            // Don't let those exceptions block the build, this is an informational message only
             listener.getLogger().println("Exception logging commit message for " + revToBuild + ": " + ge.getMessage());
         }