Error in executing tutorials due to "TypeError: cannot use a string pattern on a bytes-like object"

[bobleesj]

Problem

First error:
https://www.diffpy.org/diffpy.srmise/tutorial/extract_single_peak.html

imac@imacs-iMac examples % srmise data/Ag_nyquist_qmax30.gr --no-extract --plot

returns:

can only concatenate str (not "NoneType") to str

Second error:
https://www.diffpy.org/diffpy.srmise/tutorial/parameter_summary.html

python parameter_summary.py

returns:

imac@imacs-iMac examples % python parameter_summary.py
Traceback (most recent call last):
  File "/Users/imac/Downloads/dev/bg/diffpy.srmise/doc/examples/parameter_summary.py", line 236, in <module>
    run()
  File "/Users/imac/Downloads/dev/bg/diffpy.srmise/doc/examples/parameter_summary.py", line 45, in run
    ppe.loadpdf("data/TiO2_fine_qmax26.gr")
  File "/Users/imac/Downloads/dev/bg/diffpy.srmise/src/diffpy/srmise/pdfpeakextraction.py", line 87, in loadpdf
    d.read(pdf)
  File "/Users/imac/Downloads/dev/bg/diffpy.srmise/src/diffpy/srmise/pdfdataset.py", line 205, in read
    self.readStr(open(filename, "rb").read())
  File "/Users/imac/Downloads/dev/bg/diffpy.srmise/src/diffpy/srmise/pdfdataset.py", line 231, in readStr
    res = re.search(r"^#+ start data\s*(?:#.*\s+)*", datastring, re.M)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/imac/miniconda3/envs/srmise/lib/python3.12/re/__init__.py", line 177, in search
    return _compile(pattern, flags).search(string)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: cannot use a string pattern on a bytes-like object

Proposed solution

Reporting the bug first for now.

[bobleesj]

Progress made - PR on the way.