Fix empty container layer history and UI (#21251) (#21278)

Backport of #21251

Author: KN4CK3R

Diff for: modules/packages/container/metadata.go

@@ -95,7 +95,9 @@ func parseOCIImageConfig(r io.Reader) (*Metadata, error) {
 		if i := strings.Index(cmd, "#(nop) "); i != -1 {
 			cmd = strings.TrimSpace(cmd[i+7:])
 		}
-		imageLayers = append(imageLayers, cmd)
+		if cmd != "" {
+			imageLayers = append(imageLayers, cmd)
+		}
 	}
 
 	metadata := &Metadata{

Diff for: templates/package/content/container.tmpl

@@ -43,7 +43,7 @@
 	{{if .PackageDescriptor.Metadata.ImageLayers}}
 		<h4 class="ui top attached header">{{.i18n.Tr "packages.container.layers"}}</h4>
 		<div class="ui attached segment">
-			<table id="notice-table" class="ui very basic compact table">
+			<table class="ui very basic compact table">
 				<tbody>
 					{{range .PackageDescriptor.Metadata.ImageLayers}}
 						<tr>
@@ -57,7 +57,7 @@
 	{{if .PackageDescriptor.Metadata.Labels}}
 		<h4 class="ui top attached header">{{.i18n.Tr "packages.container.labels"}}</h4>
 		<div class="ui attached segment">
-			<table id="notice-table" class="ui very basic compact table">
+			<table class="ui very basic compact table container-labels">
 				<thead>
 					<tr>
 						<th>{{.i18n.Tr "packages.container.labels.key"}}</th>

Diff for: web_src/less/_package.less

@@ -0,0 +1,9 @@
+.container-labels {
+  td:nth-child(1) {
+    vertical-align: top;
+  }
+
+  td:nth-child(2) {
+    overflow-wrap: anywhere;
+  }
+}

Diff for: web_src/less/index.less

@@ -34,5 +34,6 @@
 @import "_admin";
 @import "_explore";
 @import "_review";
+@import "_package";
 
 @import "./helpers.less";