fix(buckets): Avoid error messages for unexpected dir

[HUMORCE]

Description

Motivation and Context

Closes #XXXX

Relates to #XXXX

How Has This Been Tested?

Before:

❯ scoop bucket list
Get-Item : Cannot find path 'C:\Users\humorce\scoop\buckets\empty_dir\bucket' because it does not exist.
At C:\Users\humorce\scoop\apps\scoop\current\lib\buckets.ps1:114 char:32
+             $bucket.Updated = (Get-Item "$path\bucket").LastWriteTime
+                                ~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (C:\Users\humorc...mpty_dir\bucket:String) [Get-Item], ItemNotFoundException
    + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.GetItemCommand


Name      Source                                     Updated               Manifests
----      ------                                     -------               ---------
main      git@github.com:ScoopInstaller/Main.git     6/19/2023 8:24:16 PM       1207
extras    git@github.com:ScoopInstaller/Extras.git   6/19/2023 10:46:52 PM      1881
versions  git@github.com:ScoopInstaller/Versions.git 6/19/2023 8:27:52 PM        425
java      git@github.com:ScoopInstaller/Java.git     6/18/2023 4:17:50 PM        253
empty_dir ~\scoop\buckets\empty_dir                                                0
nuke      git@github.com:HUMORCE/nuke.git            6/19/2023 6:04:32 PM        138

After:

❯ scoop bucket list

Name      Source                                     Updated               Manifests
----      ------                                     -------               ---------
main      git@github.com:ScoopInstaller/Main.git     6/19/2023 8:24:16 PM       1207
extras    git@github.com:ScoopInstaller/Extras.git   6/19/2023 10:46:52 PM      1881
versions  git@github.com:ScoopInstaller/Versions.git 6/19/2023 8:27:52 PM        425
java      git@github.com:ScoopInstaller/Java.git     6/18/2023 4:17:50 PM        253
empty_dir ~\scoop\buckets\empty_dir                                                0
nuke      git@github.com:HUMORCE/nuke.git            6/19/2023 6:04:32 PM        138

Checklist:

• I have read the Contributing Guide.
• I have ensured that I am targeting the develop branch.
• I have updated the documentation accordingly.
• I have updated the tests accordingly.
• I have added an entry in the CHANGELOG.