Which additional diagnostics could I run to pin down the problem with the following filter:

#!/usr/bin/env python
from pandocfilters import toJSONFilter, Str, Emph
def change(key, value, format, meta):
if format == 'odt':
if key == 'Str' and value == 'and':
return(Emph(Str(value)))
if __name__ == "__main__":
toJSONFilter(change)

Using "pandoc -o text.odt --filter filter.py text.md" gives me the error message:

Error running filter filter.py:
Error in $.blocks[0].c[2].c: expected [a], encountered Object

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