Added start blocke on no database connection available

lib/DB/AddressDAO.py

@@ -4,9 +4,12 @@ import json
 
 
 class AddressDAO:
+    __cur = None
     def __init__(self):
+        #print(f"*** File: {__file__}, init()")
         self.__con = DbManager().getConnection()
-        self.__cur = self.__con.cursor()
+        if self.__con:
+            self.__cur = self.__con.cursor()
 
 
     def __importPlz(self):
@@ -29,6 +32,9 @@ class AddressDAO:
                 print("FINISHED")#
 
     def getAddressData(self, all = True, zipcode = None):
-        self.__cur.callproc("getAddress", (all, zipcode,))
-        self.__data = self.__cur.fetchall()
-        return self.__data
+        if self.__cur:
+            self.__cur.callproc("getAddress", (all, zipcode,))
+            self.__data = self.__cur.fetchall()
+            return self.__data
+        else:
+            return None