Bug 46164 [Tasks] Go To enabled for non-file markers
build I20031105 Go To in the Tasks view is enabled even for a manually created task. It should only be enabled for tasks on files.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/ActionOpenMarker.java
if (file.getLocation() == null
							|| file.getLocationURI() == null)
						return; 
					IDE.openEditor(part.getSite().getPage(), marker,
							OpenStrategy.activateOnOpen());
				} catch (PartInitException e) {
					
					
					
					
					CoreException nestedException = null;
					IStatus status = e.getStatus();
					if (status != null
							&& status.getException() instanceof CoreException) {
						nestedException = (CoreException) status.getException();
					}
					if (nestedException != null) {
						
						
						reportStatus(nestedException.getStatus());
					} else {
						
						
						reportError(e.getLocalizedMessage());
					}
				}
			}
		}
	}
	/**