fix(#105) Avoiding stuck into waiting an output from exiftool

[Rondineli]

Before

PyExiftool would get stuck if stdout dont bring anything, a timeoutError system would need to force reads stdeer.

How to reproduce:

import exiftool

pic = b"/tmp/tmpv3xu9816"
# for some reason, exiftool does not like `-` and or ` ` at end of tags
params = tuple([b'-CreationDate=2025:07:09', b'-Description=anything Here \n-',])
param_tuple = (*params, pic)

# this will make the process to hang waiting an stdout
with exiftool.ExifTool() as exif_handle:
    exif_handle.execute(*param_tuple)
    

After

PyExiftool will wait for few seconds and if nothing is returned, proceed and reads from stdeer