fix: kleinanzige listing might have a different structure

[strech345]

when a listing was created with no image the preview will have a different structure, also when the image was added later.

[orangecoding]

@strech345 did you run the tests (non offline ones)?

[strech345]

@orangecoding you mean yarn test?

i got a error which i think not relay on my change

 test/provider/immoswp.test.js > #immoswp testsuite() > should test immoswp provider 60040ms
   → Test timed out in 60000ms.
If this is a long-running test, pass a timeout value as the last argument or configure it globally with "testTimeout".

not shure if other tests are missing because of this error.