refactoring code

src/main/java/de/srsoftware/widerhall/data/User.java

@@ -138,6 +138,17 @@ public class User {
         return (permissions & permission) > 0;
     }
 
+    public static User load(String email) throws SQLException {
+        var rs = Database.open().select(TABLE_NAME).where(EMAIL,email).compile().exec();
+        try {
+            if (rs.next()) {
+                return User.from(rs);
+            }
+            return null;
+        } finally {
+            rs.close();
+        }
+    }
 
     /**
      * Load the list of all users. Internally calls loadAll(null)