fix: #1667 Added placeholder image

[vik4114]

What

-Added placeholder image when no internet

Screenshot

WhatsApp.Video.2022-05-03.at.12.28.39.AM.mp4

Fixes bug(s)

• Fixes: Show something in the photo carousel when no internet connection #1667

[M123-dev]

Looks good @vik4114 just one small comment

[g123k]

Hi @vik4114,

Here are a few comments on your PR:

• You provide an image of 1200x1200, but only use 1000px. The image should be at the right size
• You only give a "1x" image. You should also do the same with 2x & 3x (@ see https://docs.flutter.dev/development/ui/assets-and-images)
• Please follow our guidelines in terms of filenames

[codecov-commenter]

Codecov Report

Merging #1733 (e592586) into develop (2ea0da3) will decrease coverage by 0.76%.
The diff coverage is 0.66%.

@@            Coverage Diff             @@
##           develop   #1733      +/-   ##
==========================================
- Coverage     8.86%   8.09%   -0.77%     
==========================================
  Files          161     168       +7     
  Lines         6623    7350     +727     
==========================================
+ Hits           587     595       +8     
- Misses        6036    6755     +719     

Impacted Files	Coverage Δ
...h_app/lib/cards/category_cards/abstract_cache.dart	0.00% <0.00%> (ø)
...p/lib/cards/category_cards/asset_cache_helper.dart	0.00% <0.00%> (ø)
...p/lib/cards/category_cards/raster_async_asset.dart	0.00% <0.00%> (ø)
...oth_app/lib/cards/category_cards/raster_cache.dart	0.00% <0.00%> (ø)
..._app/lib/cards/category_cards/svg_async_asset.dart	0.00% <0.00%> (ø)
...smooth_app/lib/cards/category_cards/svg_cache.dart	0.00% <0.00%> (ø)
...th_app/lib/cards/data_cards/image_upload_card.dart	0.00% <0.00%> (ø)
...t_cards/knowledge_panels/knowledge_panel_card.dart	0.00% <0.00%> (ø)
...t_cards/knowledge_panels/knowledge_panel_page.dart	0.00% <0.00%> (ø)
...knowledge_panels/knowledge_panel_summary_card.dart	0.00% <ø> (ø)
... and 64 more

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[vik4114]

New Screenshot

[M123-dev]

Looks good, thanks a lot @vik4114