Simplify image picking code

lib/ui/tiles/post_tile.dart

@@ -26,9 +26,11 @@ import 'package:comunic/utils/post_utils.dart';
 import 'package:comunic/utils/ui_utils.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
-import 'package:image_picker/image_picker.dart';
 import 'package:url_launcher/url_launcher.dart';
 
+import '../../models/api_request.dart';
+import '../../utils/log_utils.dart';
+
 /// Single posts tile
 ///
 /// @author Pierre HUBERT
@@ -77,7 +79,7 @@ class _PostTileState extends State<PostTile> {
 
   // Class members
   TextEditingController _commentController = TextEditingController();
-  PickedFile _commentImage;
+  BytesFile _commentImage;
   bool _submitting = false;
   int _maxNumberOfCommentToShow = 10;
 
@@ -493,11 +495,16 @@ class _PostTileState extends State<PostTile> {
       return;
     }
 
-    // Pick a new image
-    final newImage = await pickImage(context);
-    setState(() {
-      _commentImage = newImage;
-    });
+    try {
+      // Pick a new image
+      final newImage = await pickImage(context);
+      setState(() {
+        _commentImage = newImage;
+      });
+    } catch (e, s) {
+      logError(e, s);
+      snack(context, tr("Failed to choose an image!"));
+    }
   }
 
   /// Submit comment entered by the user