Plugin prints error message when trying to process image files

[chriskinzel]

🐞 Bug report

Description

The plugin does not automatically ignore image files and will instead error out and print an error message to the console during Scully build. The plugin handler is skipped so this does not result in build failure, but the generated error messages are noise in the console.

The ideal behaviour here would be to just skip processing image files

🔬 Minimal Reproduction

Any Scully project using the scully-plugin-minify-html plugin in defaultPostRenderers of the Scully config with a fileHandler plugin registered e.g. registerPlugin('fileHandler', 'png', imageFilePlugin);.

💻Your Environment

Angular Version:

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 11.0.5
Node: 14.8.0
OS: darwin x64

Angular: 11.0.5
... animations, cli, common, compiler, compiler-cli, core
... elements, forms, platform-browser, platform-browser-dynamic
... router
Ivy Workspace: Yes

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1100.5
@angular-devkit/build-angular   0.1100.5
@angular-devkit/core            11.0.5
@angular-devkit/schematics      11.0.5
@angular/cdk                    11.0.3
@angular/material               11.0.3
@schematics/angular             11.0.5
@schematics/update              0.1100.5
rxjs                            6.6.3
typescript                      4.0.5

Scully Version:

"@scullyio/init": "^1.0.1"
"@scullyio/ng-lib": "^1.0.0"
"@scullyio/scully": "^1.0.0"
"scully-plugin-minify-html": "^5.0.0"

🔥 Exception or Error

Error during content generation with plugin "minifyHtml" for ./projects/website/blog-posts/images/banner.jpg. This hander is skipped.

[samvloeberghs]

Please provide a reproduction.
I have not seen this error before. It will be easy to solve it when I have the reproduction.