Added exception handling extension method

I18N Commander/Processor/ExtensionsError.cs

@@ -0,0 +1,27 @@
+using System.Text;
+using DataModel;
+using Microsoft.Data.Sqlite;
+
+namespace Processor;
+
+public static class ExtensionsError
+{
+    public static ProcessorResult<TResult> ToProcessorResult<TResult>(this Exception exception) where TResult : class
+    {
+        if(exception.InnerException is SqliteException sqliteException)
+            if (sqliteException.SqliteErrorCode is 14)
+            {
+                var blockingProcesses = SystemUtil.WhoIsLocking(Setup.DataFile);
+                var sb = new StringBuilder();
+                sb.AppendLine($"The data file is used by the {blockingProcesses.Count} other process(es) listed below:");
+                foreach (var blockingProcess in blockingProcesses)
+                    sb.AppendLine($"- {blockingProcess.ProcessName} (id={blockingProcess.Id})");
+                
+                return new ProcessorResult<TResult>(null, false, sb.ToString());
+            }
+            else
+                return new ProcessorResult<TResult>(null, false, $"A database error occurred: '{sqliteException.Message}'");
+            
+        return new ProcessorResult<TResult>(null, false, $"A database error occurred: '{exception.Message}'");
+    }
+}