[share_plus] crashes on iOS when a share text starts with https://

[justacid]

The recently added URL detection on iOS crashes if a share text starts with https:// followed by some other text. Presumably because the NSURL object is nil if an invalid url is encountered. This was introduced with commit 4ede365.

System info

Issue occurs on: iOS
Plugin name: share_plus
Plugin version: 2.1.5+

Steps to Reproduce

Simply call share with an url followed by some other text.

Share.share('https://pub.dev SOMETHING');

Logs

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[0]'
*** First throw call stack:
(0x18128805c 0x1997a2f54 0x181391538 0x18138ec5c 0x1812100f8 0x18123c164 0x1044fe4cc 0x1044fdd6c 0x106f59898 0x106aa5fa0 0x106db1690 0x106d5643c 0x106d59a34 0x18129d278 0x181221c50 0x18121c44c 0x1811fac68 0x18120e3c8 0x19ca1f38c 0x183bb40bc 0x183931be8 0x102511bcc 0x103885a24)
libc++abi: terminating with uncaught exception of type NSException
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
    frame #0: 0x00000001b7cd89c4 libsystem_kernel.dylib`__pthread_kill + 8
libsystem_kernel.dylib`__pthread_kill:
->  0x1b7cd89c4 <+8>:  b.lo   0x1b7cd89e4               ; <+40>
    0x1b7cd89c8 <+12>: pacibsp 
    0x1b7cd89cc <+16>: stp    x29, x30, [sp, #-0x10]!
    0x1b7cd89d0 <+20>: mov    x29, sp