Bug 575641 - restore silence on error in readDocument()

That produces lot of irrelevant log entries with async editor diff
operations on quickly changing resources.

Change-Id: I7eee3163df092256f367c48400df453525e6f868
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.text/+/185357
Tested-by: Platform Bot <platform-bot@eclipse.org>
diff --git a/org.eclipse.ui.editors/src/org/eclipse/ui/internal/editors/quickdiff/LastSaveReferenceProvider.java b/org.eclipse.ui.editors/src/org/eclipse/ui/internal/editors/quickdiff/LastSaveReferenceProvider.java
index 32e13b6..18a2735 100644
--- a/org.eclipse.ui.editors/src/org/eclipse/ui/internal/editors/quickdiff/LastSaveReferenceProvider.java
+++ b/org.eclipse.ui.editors/src/org/eclipse/ui/internal/editors/quickdiff/LastSaveReferenceProvider.java
@@ -44,7 +44,6 @@
 import org.eclipse.ui.IStorageEditorInput;
 import org.eclipse.ui.IWorkbenchPartSite;
 import org.eclipse.ui.IWorkbenchWindow;
-import org.eclipse.ui.internal.editors.text.EditorsPlugin;
 
 import org.eclipse.ui.texteditor.IDocumentProvider;
 import org.eclipse.ui.texteditor.IElementStateListener;
@@ -251,7 +250,6 @@
 				}
 
 			} catch (CoreException e) {
-				EditorsPlugin.log(e);
 				return;
 			}