Uses safe dispose for commands

Author: alex-kulakov

Orm/Xtensive.Orm/Orm/Providers/CommandProcessing/BatchingCommandProcessor.cs

@@ -176,7 +176,7 @@ private Command ExecuteBatch(int numberOfTasks, QueryRequest lastRequest, Comman
       }
       finally {
         if (!shouldReturnReader) {
-          context.ActiveCommand.Dispose();
+          context.ActiveCommand.DisposeSafely();
         }
         ReleaseCommand(context);
       }
@@ -245,7 +245,7 @@ private async Task<Command> ExecuteBatchAsync(int numberOfTasks, QueryRequest la
       }
       finally {
         if (!shouldReturnReader) {
-          await context.ActiveCommand.DisposeAsync().ConfigureAwait(false);
+          await context.ActiveCommand.DisposeSafelyAsync().ConfigureAwait(false);
         }
 
         ReleaseCommand(context);

Orm/Xtensive.Orm/Orm/Providers/CommandProcessing/SimpleCommandProcessor.cs

@@ -100,7 +100,7 @@ public override async Task ExecuteTasksAsync(CommandProcessorContext context, Ca
           }
         }
         finally {
-          await context.ActiveCommand.DisposeAsync().ConfigureAwait(false);
+          await context.ActiveCommand.DisposeSafelyAsync().ConfigureAwait(false);
           ReleaseCommand(context);
         }
       }