Fixes accessibility of empty repository commit status (#22632)

Avoid empty labelled anchor in repo without commits.

Contributed by @forgejo.

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docs/content/doc/packages/pypi.en-us.md

@@ -77,6 +77,8 @@ For example:
 pip install --index-url https://testuser:password123@gitea.example.com/api/packages/testuser/pypi/simple --no-deps test_package
 ```
 
+You can use `--extra-index-url` instead of `--index-url` but that makes you vulnerable to dependency confusion attacks because `pip` checks the official PyPi repository for the package before it checks the specified custom repository. Read the `pip` docs for more information.
+
 ## Supported commands
 
 ```

modules/migration/file_format.go

@@ -76,7 +76,7 @@ func validate(bs []byte, datatype interface{}, isJSON bool) error {
 	}
 	err = sch.Validate(v)
 	if err != nil {
-		log.Error("migration validation with %s failed for\n%s", schemaFilename, string(bs))
+		log.Error("migration validation with %s failed:\n%#v", schemaFilename, err)
 	}
 	return err
 }

templates/package/content/pypi.tmpl

@@ -4,7 +4,7 @@
 		<div class="ui form">
 			<div class="field">
 				<label>{{svg "octicon-terminal"}} {{.locale.Tr "packages.pypi.install"}}</label>
-				<div class="markup"><pre class="code-block"><code>pip install --extra-index-url {{AppUrl}}api/packages/{{.PackageDescriptor.Owner.Name}}/pypi/simple {{.PackageDescriptor.Package.Name}}</code></pre></div>
+				<div class="markup"><pre class="code-block"><code>pip install --index-url {{AppUrl}}api/packages/{{.PackageDescriptor.Owner.Name}}/pypi/simple {{.PackageDescriptor.Package.Name}}</code></pre></div>
 			</div>
 			<div class="field">
 				<label>{{.locale.Tr "packages.pypi.documentation" | Safe}}</label>

templates/repo/commit_statuses.tmpl

@@ -1,4 +1,4 @@
-<a class="ui link commit-statuses-trigger vm"{{if eq (len .Statuses) 1}}{{$status := index .Statuses 0}}{{if $status.TargetURL}} href="{{$status.TargetURL}}"{{end}}{{end}}>{{template "repo/commit_status" .Status}}</a>
+{{if eq (len .Statuses) 1}}{{$status := index .Statuses 0}}{{if $status.TargetURL}}<a class="ui link commit-statuses-trigger vm" href="{{$status.TargetURL}}">{{template "repo/commit_status" .Status}}</a>{{end}}{{end}}
 <div class="ui commit-statuses-popup commit-statuses tippy-target">
 	<div class="ui relaxed list divided">
 		{{range .Statuses}}