fix(hooks/exasol): handle non resultSet query result types

[anja-istenic]

This PR fixes an issue introduced by b7c3c96 (authored by @kazanzhy) which added iterating over ExaStatement when using ExasolHook.run().
Iteration can only be done for statements with a result_type=resultSet, for other result types, pyexasol raises ExaRuntimeError(self.connection, 'Attempt to fetch from statement without result set'). This happens for all create and drop statements (their result type is rowCount).
Therefore, an extra check is needed before the iteration.

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[kazanzhy]

Thank you for your suggestions. I really missed it.

All hooks' logic is that we fetch results only when the handler is provided.
We're assuming that for not "SELECT" operations there is no need to use a handler.

So, here we could just add additional spaces in lines 174-176.
I already fixed it in #23971 and you just could use code from there
https://github.com/apache/airflow/pull/23971/files#diff-00b215634013629b320a263630bf6948ed33c2a8528754fc78d69484e1320845

[kazanzhy]

UPD. #23971 is merged, therefore this issue probably is solved

[potiuk]

Closing as solved by #23791. If you think @anja-istenic that it's not solved, please let us know.

[anja-istenic]

Thanks both for your comments. I can confirm that PR #23971 fixes the issue I addressed with this PR. I would, however, suggest we still add the test I added here to ensure this doesn't break in the future. I've created a new PR for it: #25277