Integration crashes if not all waste types listed

[flabbamann]

At some addresses not all waste types are collected, this leads to errors, as the integration expects all waste types to be listed.

Example config where only Papier and Leichtverpackungen are collected:

sensor:
  - platform: aha_region
    gemeinde: "Hannover"
    strasse: "00726@Dragonerstr. / Vahrenwald@Vahrenwald"
    hausnr: 35
    abholplatz: "00726-0037B"