14 RFR (XXS): 8233137: runtime/ErrorHandling/VeryEarlyAssertTest.java fails after 8232080

[mark.reinhold at oracle.com]

Bug: https://bugs.openjdk.java.net/browse/JDK-8233137

My earlier changes to vmError.cpp didn’t sufficiently guard against the
vendor VM bug URL string being undefined (oops).  This was revealed by
fastdebug testing in the main-line CI.

Thanks,
- Mark


diff --git a/src/hotspot/share/utilities/vmError.cpp b/src/hotspot/share/utilities/vmError.cpp
--- a/src/hotspot/share/utilities/vmError.cpp
+++ b/src/hotspot/share/utilities/vmError.cpp
@@ -128,12 +128,14 @@
 
 static void print_bug_submit_message(outputStream *out, Thread *thread) {
   if (out == NULL) return;
-  out->print_raw_cr("# If you would like to submit a bug report, please visit:");
-  out->print_raw   ("#   ");
   const char *url = Arguments::java_vendor_url_bug();
   if (url == NULL || *url == '\0')
     url = JDK_Version::runtime_vendor_vm_bug_url();
-  out->print_raw_cr(url);
+  if (url != NULL && *url != '\0') {
+    out->print_raw_cr("# If you would like to submit a bug report, please visit:");
+    out->print_raw   ("#   ");
+    out->print_raw_cr(url);
+  }
   // If the crash is in native code, encourage user to submit a bug to the
   // provider of that code.
   if (thread && thread->is_Java_thread() &&