Improve error reporting: Extract original message when showing "Java exception messages" consistently. Improve error handling in deprecated OneDrive API stub and avoid crash by no-longer throwing in Main-thread methods.

src/Kp2aBusinessLogic/database/CheckDatabaseForChanges.cs

@@ -5,6 +5,7 @@ using System.Security.Cryptography;
 using System.Text;
 using Android.App;
 using Android.Content;
+using KeePass.Util;
 using KeePassLib.Cryptography;
 using KeePassLib.Serialization;
 using KeePassLib.Utility;
@@ -65,7 +66,7 @@ namespace keepass2android
 			}
 			catch (Exception e)
 			{
-				Finish(false, e.Message);
+				Finish(false, ExceptionUtil.GetErrorMessage(e));
 			}
 
 		}