Test failure: separate_prod_fin_test

[heifner]

https://github.com/AntelopeIO/spring/actions/runs/11788970348/job/32837287849

Traceback (most recent call last):
  File "/__w/spring/spring/build/tests/separate_prod_fin_test.py", line 75, in <module>
    qc_ext = block["qc_extension"]
KeyError: 'qc_extension'

Need to update test to check that qc_extension is in the block before trying to access it.

The test does try to look for it in other blocks, but fails to check that it is there before trying to access it.

    while i < 3: # slow ci/cd might not get all votes in time, try a few blocks
        # LIB has advanced, which indicate at least 2 of non-producer finalizers have voted.
        block_num = cluster.getNode(1).getIrreversibleBlockNum()
        block = cluster.getNode(1).getBlock(block_num)
        qc_ext = block["qc_extension"]
        Print(f'{qc_ext}')
        # "11111" is the representation of a bitset showing which finalizers have voted (we have five total finalizers)
        if qc_ext["qc"]["active_policy_sig"]["strong_votes"] == "11111":
            break
        cluster.getNode(1).waitForLibToAdvance()
        i += 1
    assert i < 3, "Not all finalizers voted"