Code improvement, thanks to @valfirst

Author: diemol

java/src/org/openqa/selenium/remote/RemoteWebDriver.java

@@ -574,11 +574,11 @@ protected Response execute(CommandPayload payload) {
         } else {
           // When this exception comes from a remote end, the real cause is usually hidden in the
           // cause. Let's try to rescue it and display it at the top level.
-          String cause = e.getCause() != null ? e.getCause().getMessage() : "";
+          String cause = e.getCause() != null ? " " + e.getCause().getMessage() : "";
           toThrow =
               new SessionNotCreatedException(
                   "Possible causes are invalid address of the remote server or browser start-up"
-                      + " failure. "
+                      + " failure."
                       + cause,
                   e);
         }