Small improvement

app/src/main/java/eu/faircode/email/EntityAnswer.java

@@ -69,13 +69,17 @@ public class EntityAnswer implements Serializable {
         if (fullName != null) {
             fullName = fullName.trim();
             int c = fullName.lastIndexOf(",");
-            if (c < 0)
+            if (c > 0) {
+                last = fullName.substring(0, c).trim();
+                first = fullName.substring(c + 1).trim();
+            } else {
                 c = fullName.lastIndexOf(" ");
                 if (c > 0) {
                     first = fullName.substring(0, c).trim();
                     last = fullName.substring(c + 1).trim();
                 }
             }
+        }
 
         text = text.replace("$name$", fullName == null ? "" : fullName);
         text = text.replace("$firstname$", first == null ? "" : first);