When Data is empty, there will get an error: AttributeError: 'SymProTextRead' object has no attribute 'data'

[Ruk1ng001]

This is first txt file read in data_dir. Data is empty:

NRG Systems SymphoniePRO Desktop Application
Software Version:	3.15.0.11 (build built by CI server 2023-06-13)
... ...
... ...

Channel:	17
Effective Date:	2023-08-16 22:05:03
Type:	Analog
Data Logging Mode:	Statistics
Description:	NRG RH5X Humi
Serial Number:	
Height:	10.00
Bearing:	0.00
Scale Factor:	20.00000
Offset:	0.00000
Units:	%RH
Reference Voltage:	5 V
Excitation Mode:	Constant On
Excitation Value:	12 V

Data

I have other txt files in this dir.

        reader = nrgpy.SymProTextRead()
        reader.concat_txt(txt_dir=data_dir, ch_details=True, start_date=start_date, progress_bar=False)
        print(reader.data)

I got an error:

AttributeError: 'SymProTextRead' object has no attribute 'data'