Errors in RF export with None data

Refs issue ~~#750~~ PHE 2019 DX and RF exports

If NoneType found instead of string in acquisition_protocol, or in fluoro_frame_rates then a Type error is thrown:

[2020-01-06 22:50:54,341: ERROR/ForkPoolWorker-4] Task remapp.exports.rf_export.rf_phe_2019[a1dc0122-f793-47b5-a15e-2c5af2bb4247] raised unexpected: TypeError('sequence item 0: expected str instance, NoneType found',)
Traceback (most recent call last):
  File "/path/vep3d22/lib/python3.6/site-packages/celery/app/trace.py", line 382, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/path/vep3d22/lib/python3.6/site-packages/celery/app/trace.py", line 641, in __protected_call__
    return self.run(*args, **kwargs)
  File "/otherpath/openrem/remapp/exports/rf_export.py", line 883, in rf_phe_2019
    u' | '.join(fluoro_events.order_by().values_list('acquisition_protocol', flat=True).distinct()),
TypeError: sequence item 0: expected str instance, NoneType found

and

[2020-01-07 08:26:07,145: ERROR/ForkPoolWorker-4] Task remapp.exports.rf_export.rf_phe_2019[26d05cc7-6989-4632-b79c-9e9eb68b3b6b] raised unexpected: TypeError('unsupported format string passed to NoneType.__format__',)
Traceback (most recent call last):
  File "/path/vep3d22/lib/python3.6/site-packages/celery/app/trace.py", line 382, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/path/vep3d22/lib/python3.6/site-packages/celery/app/trace.py", line 641, in __protected_call__
    return self.run(*args, **kwargs)
  File "/otherpath/openrem/remapp/exports/rf_export.py", line 897, in rf_phe_2019
    column_aq += u' | '.join(format(x, "1.1f") for x in fluoro_frame_rates)
  File "/otherpath/openrem/remapp/exports/rf_export.py", line 897, in <genexpr>
    column_aq += u' | '.join(format(x, "1.1f") for x in fluoro_frame_rates)
TypeError: unsupported format string passed to NoneType.__format__

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