fix crash Tansfers view

iOSClient/Favorites/CCFavorites.m

@@ -289,7 +289,9 @@
 
 - (void)triggerProgressTask:(NSNotification *)notification
 {
-    [[NCMainCommon sharedInstance] triggerProgressTask:notification sectionDataSourceFileIDIndexPath:sectionDataSource.fileIDIndexPath tableView:self.tableView viewController:self serverUrlViewController:self.serverUrl];
+    if (sectionDataSource.fileIDIndexPath != nil) {
+        [[NCMainCommon sharedInstance] triggerProgressTask:notification sectionDataSourceFileIDIndexPath:sectionDataSource.fileIDIndexPath tableView:self.tableView viewController:self serverUrlViewController:self.serverUrl];
+    }
 }
 
 - (void)cancelTaskButton:(id)sender withEvent:(UIEvent *)event

iOSClient/Main/CCMain.m

@@ -1833,7 +1833,9 @@
 
 - (void)triggerProgressTask:(NSNotification *)notification
 {
-    [[NCMainCommon sharedInstance] triggerProgressTask:notification sectionDataSourceFileIDIndexPath:sectionDataSource.fileIDIndexPath tableView:self.tableView viewController:self serverUrlViewController:self.serverUrl];    
+    if (sectionDataSource.fileIDIndexPath != nil) {
+        [[NCMainCommon sharedInstance] triggerProgressTask:notification sectionDataSourceFileIDIndexPath:sectionDataSource.fileIDIndexPath tableView:self.tableView viewController:self serverUrlViewController:self.serverUrl];
+    }
 }
 
 - (void)cancelTaskButton:(id)sender withEvent:(UIEvent *)event

iOSClient/Main/NCMainCommon.swift

@@ -86,8 +86,8 @@ class NCMainCommon: NSObject, PhotoEditorDelegate {
                     image = "↑"
                 }
                 
-                cell.labelInfoFile.text = CCUtility.transformedSize(totalBytesExpected) + " - " + image + CCUtility.transformedSize(totalBytes)
-                cell.transferButton.progress = progress
+                cell.labelInfoFile?.text = CCUtility.transformedSize(totalBytesExpected) + " - " + image + CCUtility.transformedSize(totalBytes)
+                cell.transferButton?.progress = progress
             }
         }
     }

iOSClient/Transfers/CCTransfers.m

@@ -150,7 +150,9 @@
 
 - (void)triggerProgressTask:(NSNotification *)notification
 {
-    [[NCMainCommon sharedInstance] triggerProgressTask:notification sectionDataSourceFileIDIndexPath:sectionDataSource.fileIDIndexPath tableView:self.tableView viewController:self serverUrlViewController:nil];
+    if (sectionDataSource.fileIDIndexPath != nil) {
+        [[NCMainCommon sharedInstance] triggerProgressTask:notification sectionDataSourceFileIDIndexPath:sectionDataSource.fileIDIndexPath tableView:self.tableView viewController:self serverUrlViewController:nil];
+    }
 }
 
 - (void)cancelTaskButton:(id)sender withEvent:(UIEvent *)event