[Python] Fix schema not found error on vendor specific data

[marcelveldt]

When Vendor specific data is sent in a read subscription where there is no schema present for the specific Attribute, it is not possible to instantiate a TypedAttributePath due to the simple fact there is not AttributeSchema for that vendor specific data which is fine.

Problem is that the report sends multiple changed values at once so when the above happens, all other values in the same report are also lost (because the Exception is thrown in instantiating the TypedAttributePath of one of the values in the same "burst").

This addresses that issue:

• Still raise an Exception if the schema was not found found but use KeyError instead of the too generic "Exception".
• Catch the KeyError (and already existing ValueError) and log it.
• Still call the "OnAttributeChangeCb" callback for other values in the report.

[CLAassistant]

All committers have signed the CLA.

[github-actions]

PR #26120: Size comparison from 3037a8a to 3dde53e

Increases (1 build for cc32xx)

platform	target	config	section	3037a8a	3dde53e	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL	.debug_info	20328411	20328412	1	0.0

Full report (1 build for cc32xx)

platform	target	config	section	3037a8a	3dde53e	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	643249	643249	0	0.0
			(read/write)	203848	203848	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197248	197248	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	933224	933224	0	0.0
			.debug_aranges	87792	87792	0	0.0
			.debug_frame	302140	302140	0	0.0
			.debug_info	20328411	20328412	1	0.0
			.debug_line	2687890	2687890	0	0.0
			.debug_loc	2838930	2838930	0	0.0
			.debug_ranges	288072	288072	0	0.0
			.debug_str	3042155	3042155	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	104401	104401	0	0.0
			.shstrtab	232	232	0	0.0
			.stab	204	204	0	0.0
			.stabstr	441	441	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	377963	377963	0	0.0
			.symtab	256976	256976	0	0.0
			.text	536728	536728	0	0.0

[github-actions]

PR #26120: Size comparison from 2b3d5c3 to ed51953

Increases (1 build for cc32xx)

platform	target	config	section	2b3d5c3	ed51953	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL	.debug_info	20328411	20328412	1	0.0

Full report (1 build for cc32xx)

platform	target	config	section	2b3d5c3	ed51953	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	643249	643249	0	0.0
			(read/write)	203848	203848	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197248	197248	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	933224	933224	0	0.0
			.debug_aranges	87792	87792	0	0.0
			.debug_frame	302140	302140	0	0.0
			.debug_info	20328411	20328412	1	0.0
			.debug_line	2687890	2687890	0	0.0
			.debug_loc	2838930	2838930	0	0.0
			.debug_ranges	288072	288072	0	0.0
			.debug_str	3042155	3042155	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	104401	104401	0	0.0
			.shstrtab	232	232	0	0.0
			.stab	204	204	0	0.0
			.stabstr	441	441	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	377963	377963	0	0.0
			.symtab	256976	256976	0	0.0
			.text	536728	536728	0	0.0