getprop_or_none acts as getprop

[HorizonEmuTeam]

I am getting an error because panel.py couldn't find an optional property. Getprop_or_none() is used, but the program returns getprop()'s error and fails. Expected behaviour is getprop_or_none() ignoring the unfound property and just returning nothing.
Log:
Parsing: dsi-panel-oplus-senna-bc-nt37705-1240-2772-dsc-cmd.dtb
Parsing: oplus_senna_bc_nt37705_1240_2772_dsc_cmd (senna ab575 tm nt37705 dsc cmd mode panel)
WARNING: Multiple display timings are not supported yet, using first!
ERROR: Failed to get property: qcom,mdss-dsi-bl-pmic-control-type
Traceback (most recent call last):
File "/home/user/linux-mdss-dsi-panel-driver-generator/lmdpdg.py", line 77, in
panel = Panel.parse(fdt, offset)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/linux-mdss-dsi-panel-driver-generator/panel.py", line 334, in parse
return name and Panel(name.as_str(), fdt, node)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/linux-mdss-dsi-panel-driver-generator/panel.py", line 233, in init
backlight = fdt.getprop_or_none(node, 'qcom,mdss-dsi-bl-pmic-control-type')
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/linux-mdss-dsi-panel-driver-generator/fdt2.py", line 38, in getprop_or_none
prop = self.getprop(nodeoffset, prop_name, [FDT_ERR_NOTFOUND])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/linux-mdss-dsi-panel-driver-generator/fdt2.py", line 32, in getprop
return super().getprop(nodeoffset, prop_name, quiet)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/.local/lib/python3.12/site-packages/libfdt.py", line 454, in getprop
return Property(prop_name, bytearray(pdata[0]))
^^^^^^^^^^^^^^^^^^^
TypeError: cannot convert 'NoneType' object to bytearray
dsi-panel-oplus-senna-bc-nt37705-1240-2772-dsc-cmd.dtb does not contain any usable panel specifications

[HorizonEmuTeam]

I am using Python 3.12.3 (main, Nov 6 2024, 18:32:19) and latest current release of linux-mdss-dsi-panel-driver-generator, also pylibfdt from dtc 1.7.2.

[stephan-gh]

This feels related to https://git.kernel.org/pub/scm/utils/dtc/dtc.git/commit/?id=9a969f3b70b07bbf1c9df44a38d7f8d1d3a6e2a5, can you try if latest pylibfdt (from main branch) fixes it?