Fix blank whitespace in person card when optional fields are not present

src/main/java/seedu/address/ui/PersonCard.java

@@ -52,8 +52,18 @@
         id.setText(displayedIndex + ". ");
         name.setText(person.getName().fullName);
         phone.setText(person.getPhone().value);
-        address.setText(person.hasAddress() ? person.getAddress().get().value : "");
-        email.setText(person.hasEmail() ? person.getEmail().get().value : "");
+        if (person.hasAddress()) {
+            address.setText(person.getAddress().get().value);
+        } else {
+            address.setText("");
+            address.setManaged(false);
+        }
+        if (person.hasEmail()) {
+            email.setText(person.getEmail().get().value);
+        } else {
+            email.setText("");
+            email.setManaged(false);
+        }
         person.getTags().stream()
                 .sorted(Comparator.comparing(tag -> tag.tagName))
                 .forEach(tag -> tags.getChildren().add(new Label(tag.tagName)));

src/main/resources/view/DarkTheme.css

@@ -99,13 +99,7 @@
     -fx-padding: 0 0 0 0;
 }
 
-.list-cell:filled:even {
-    /* even list cells, 0,2,4... */
-    -fx-background-color: #c5e3f9;
-}
-
-.list-cell:filled:odd {
-    /* odd list cells, 1,3,5... */
+.list-cell:filled {
     -fx-background-color: #c5e3f9;
 }