Running heuristic on txt file outputs folders but not files

```physiobids.py -in Example.txt -chtrig 0 -ntp 1100 -tr 0.555 -thr 0.73 -heur heur_ex.py -sub 023 -ses 29
File extension is .txt
File exists
File Example.txt contains:

Interval=	0.001 s

ChannelTitle=	Trigger	CO2	O2	Pulse

UnitName=	*	mmHg	mmHg	*

Preparing BIDS output using heur_ex.py
```