Terminating app due to uncaught exception 'NSInvalidArgumentException'

[super-cache-money]

Thanks for this super nifty-seeming tool.

Right at the end, when actually running it, I get a whole bunch of output which makes it seem like it's working. The last of which is:

2018-01-07 01:57:34.725 watoi[9470:32807909] 	 is group chat
2018-01-07 01:57:34.725 watoi[9470:32807909] 	 not found member 27123456789@s.whatsapp.net
2018-01-07 01:57:34.728 watoi[9470:32807909] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Unacceptable type of value for attribute: property = "isAdmin"; desired type = NSNumber; given type = NSNull; value = <null>.'
*** First throw call stack:
(
	0   CoreFoundation                      0x00007fff8fce1452 __exceptionPreprocess + 178
	1   libobjc.A.dylib                     0x00007fff97286f7e objc_exception_throw + 48
	2   CoreData                            0x00007fff8350411c _PFManagedObject_coerceValueForKeyWithDescription + 2892
	3   CoreData                            0x00007fff834db5a1 _sharedIMPL_setvfk_core + 177
	4   watoi                               0x0000000103ebcdd6 -[Importer addMissingMember:toChat:asAdmin:] + 353
	5   watoi                               0x0000000103ebd708 -[Importer importChats] + 2067
	6   watoi                               0x0000000103ebc208 -[Importer import] + 27
	7   watoi                               0x0000000103ebbe6e main + 326
	8   libdyld.dylib                       0x00007fff980ba5ad start + 1
	9   ???                                 0x0000000000000004 0x0 + 4
)
libc++abi.dylib: terminating with uncaught exception of type NSException
[1]    9470 abort      ./build/Release/watoi ./path/to/msgstore.db

[super-cache-money]

Maybe I'm part of some weird adminless group?
I'd try to fix it by adding a null check or something, but I know zero Objective C.

[super-cache-money]

Well, TIL how to do a null check in objective C :D. Fixed. If anyone else runs into this let me know and I'll send a PR.

[residentsummer]

@super-cache-money seems like an easy fix, so could you please send a PR?

[Felizolinha]

I opened a PR for the fix, tested it in with my devices and I believe it worked as expected.