fix for crash on Android 4.x (NoBackupFilesDir is ApiLevel >= 21)

try to fall back to Samsung fingerprint API even on Android 6
-> 1.0.0c

src/Kp2aBusinessLogic/Io/BuiltInFileStorage.cs

@@ -253,7 +253,7 @@ namespace keepass2android.Io
 			if (ioc.IsLocalFile())
 			{
 				bool requiresPermission = !(ioc.Path.StartsWith(activity.Activity.FilesDir.CanonicalPath)
-												|| ioc.Path.StartsWith(activity.Activity.NoBackupFilesDir.CanonicalPath));
+												|| ioc.Path.StartsWith(IoUtil.GetInternalDirectory(activity.Activity).CanonicalPath));
 				
 				var extDirectory = activity.Activity.GetExternalFilesDir(null);
 				if ((extDirectory != null) && (ioc.Path.StartsWith(extDirectory.CanonicalPath)))

src/Kp2aBusinessLogic/Io/IoUtil.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Text;
 using Android.Content;
+using Android.OS;
 using Java.IO;
 using KeePassLib.Serialization;
 
@@ -53,7 +54,7 @@ namespace keepass2android.Io
 			try
 			{
 				File filesDir = context.FilesDir.CanonicalFile;
-				File noBackupDir = context.NoBackupFilesDir.CanonicalFile;
+				File noBackupDir = GetInternalDirectory(context).CanonicalFile;
 				File ourFile = new File(path).CanonicalFile;
 				//http://www.java2s.com/Tutorial/Java/0180__File/Checkswhetherthechilddirectoryisasubdirectoryofthebasedirectory.htm
 
@@ -93,5 +94,13 @@ namespace keepass2android.Io
 				writeTransaction.CommitWrite();
 			}
 		}
+
+		public static Java.IO.File GetInternalDirectory(Context ctx)
+		{
+			if ((int)Android.OS.Build.VERSION.SdkInt >= 21)
+				return ctx.NoBackupFilesDir;
+			else
+				return ctx.FilesDir;
+		}
 	}
 }

src/Kp2aBusinessLogic/database/edit/LoadDB.cs

@@ -101,7 +101,7 @@ namespace keepass2android
 			}
 			catch (DuplicateUuidsException e)
 			{
-				Kp2aLog.LogUnexpectedError(e);
+				Kp2aLog.Log(e.ToString());
 				Finish(false, _app.GetResourceString(UiStringKey.DuplicateUuidsError) + " " + e.Message + _app.GetResourceString(UiStringKey.DuplicateUuidsErrorAdditional), Exception);
 				return;
 			}