Make error messages when updating more useful.

Fixes issue 2084, fixes issue 2082 in a not-very-fixing sort of way

src/com/dmdirc/updater/Update.java

                 } catch (Throwable ex) {
                     setStatus(UpdateStatus.ERROR);
 
-                    Logger.appError(ErrorLevel.MEDIUM,
-                            "Error when updating component " + component, ex);
+                    Logger.appError(ErrorLevel.MEDIUM, "Error when updating component "
+                            + component.getName(), ex);
 
                     return;
                 }