fix(issue#161) Add (empty) for Studies with no PatientName value (#218)

Packages/ohif-study-list/client/components/studylist/studylistResult/studylistResult.styl

@@ -163,6 +163,9 @@ $bodyCellHeight = 40px
           white-space: nowrap
           transition(all 0.1s ease)
 
+          &.emptyValue
+            theme('color', '$uiGrayLight')
+
         &:hover, &:active, &.active
           background-color: $tableHoverColor
           color: white

Packages/ohif-study-list/client/components/studylist/studylistStudy/studylistStudy.html

@@ -1,7 +1,11 @@
 <template name="studylistStudy">
     <tr class="studylistStudy noselect {{#if this.selected}}active{{/if}}">
-        <td class="patientName">
-            {{formatPN patientName}}
+        <td class="patientName {{#unless patientName}}emptyValue{{/unless}}">
+            {{#if patientName}}
+                {{formatPN patientName}}
+            {{else}}
+                (empty)
+            {{/if}}
         </td>
         <td class="patientId">
             {{patientId}}