front: add dots to empty calculated departure time cells

Signed-off-by: Theo Macron <theo.macron0315@gmail.com>

Author: Akctarus

front/src/modules/timesStops/TimesStopsTable.tsx

@@ -309,7 +309,11 @@ const TimesStopsTable = ({
             return <span className="cell-loading-placeholder" />;
           }
           const value = info.getValue();
-          return <span>{value ? formatLocalTime(value) : ''}</span>;
+          return (
+            <span className={!value ? 'cell-empty-dot' : undefined}>
+              {value ? formatLocalTime(value) : '•'}
+            </span>
+          );
         },
         meta: {
           className: 'col-computed-departure computed',

front/src/modules/timesStops/styles/_timesStopsTable.scss

@@ -308,6 +308,12 @@
   }
 }
 
+.cell-empty-dot {
+  display: flex;
+  justify-content: center;
+  color: var(--grey80);
+}
+
 .cell-loading-placeholder {
   display: inline-block;
   width: 38px;