refactor(images): relocate tag/digest replacement

app/docker/models/image.js

@@ -4,7 +4,17 @@ function ImageViewModel(data) {
   this.Repository = data.Repository;
   this.Created = data.Created;
   this.Checked = false;
+
   this.RepoTags = data.RepoTags;
+  if (!this.RepoTags && data.RepoDigests) {
+    this.RepoTags = [];
+    for (var i = 0; i < data.RepoDigests.length; i++) {
+      var digest = data.RepoDigests[i];
+      var repository = digest.substring(0, digest.indexOf('@'));
+      this.RepoTags.push(repository + ':<none>');
+    }
+  }
+
   this.VirtualSize = data.VirtualSize;
   this.ContainerCount = data.ContainerCount;
 

app/docker/services/imageService.js

@@ -20,17 +20,6 @@ angular.module('portainer.docker')
     return deferred.promise;
   };
 
-  function replaceEmptyTagsWhenPossible(item) {
-    if (!item.RepoTags && item.RepoDigests) {
-      item.RepoTags = [];
-      for (var iDigest = 0; iDigest < item.RepoDigests.length; iDigest++) {
-        var digest = item.RepoDigests[iDigest];
-        var repository = digest.substring(0, digest.indexOf('@'));
-        item.RepoTags.push(repository + ':<none>');
-      }
-    }
-  }
-  
   service.images = function(withUsage) {
     var deferred = $q.defer();
 
@@ -49,7 +38,6 @@ angular.module('portainer.docker')
             item.ContainerCount++;
           }
         }
-        replaceEmptyTagsWhenPossible(item);
         return new ImageViewModel(item);
       });