fix on not null zip code in sql

appointment-import/src/main/java/smash/appointment/parse/Subject.java

@@ -230,7 +230,7 @@ public class Subject {
 	public void setZipCode(String zipCode) {
 		if (zipCode != null && zipCode.length() > 7) {
 			logger.warn("Surname too long. Ignoring: " + zipCode);
-			zipCode = zipCode.substring(0, 7);
+			this.zipCode = "";
 		} else {
 			this.zipCode = zipCode;
 		}