(bool)WiFiClient needs to return ::connected() since ClientContext is not destroyed on ::stop()

[d-a-v]

fix #4389 side effect

[DaleSchultz]

I have followed a chain of issues describing exceptions when Wifi disconnects, to this thread as I am experiencing this issue on a NodeMCU ESP8266 . I believe I am using 2.4.2. I am new to this and I cannot work out if this fix is now part of 2.4.2 in which case, I may need to trim my sketch down to a smaller reproducible sketch and then post it as a new issue or as a fail for this issue...

If I should be asking elsewhere please direct me gently to the right place. Thanks.

20:25:37.089 -> [Disconnected]
20:25:37.089 ->
20:25:37.089 -> Exception (28):
20:25:37.089 -> epc1=0x402057a3 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000166 depc=0x00000000
20:25:37.123 ->
20:25:37.123 -> ctx: cont
20:25:37.123 -> sp: 3ffffcf0 end: 3fffffd0 offset: 01a0
20:25:37.123 ->
20:25:37.123 -> >>>stack>>>
20:25:37.123 -> 3ffffe90: 00000000 00000000 00000000 40100575
20:25:37.123 -> 3ffffea0: 00000000 00000000 00000000 00000000
20:25:37.123 -> 3ffffeb0: 00000000 00000000 00000000 3ffef0fc
20:25:37.123 -> 3ffffec0: 3ffef23c 000000e7 000000e7 4010020c
20:25:37.123 -> 3ffffed0: 3fffdad0 00000000 3ffefe8c 401006dc
20:25:37.123 -> 3ffffee0: 3ffe9120 00000000 00000064 402052a4
20:25:37.158 -> 3ffffef0: 40205960 00000000 00001388 4020408f
20:25:37.158 -> 3fffff00: 00000000 3ffefe8c 3ffef03c 40204208
20:25:37.158 -> 3fffff10: 3fffdad0 00000000 3ffef0f4 4020361f
20:25:37.158 -> 3fffff20: 40205960 00000000 00001388 40213498
20:25:37.158 -> 3fffff30: 00000000 3ffefe8c 40205960 00000000
20:25:37.192 -> 3fffff40: 00001388 00029c3d 00000000 3ffefe8c
20:25:37.192 -> 3fffff50: 00000000 00000000 00000000 00000000
20:25:37.192 -> 3fffff60: 00000000 00000000 3ffefedc 402047c2
20:25:37.192 -> 3fffff70: 00000000 3ffeeff0 3ffef0f4 402036e2
20:25:37.192 -> 3fffff80: 402059b8 00000000 3ffec5a9 40205a08
20:25:37.226 -> 3fffff90: 00000000 3fff00ec 00000000 00000000
20:25:37.226 -> 3fffffa0: 00000000 00000000 00000001 40205391
20:25:37.226 -> 3fffffb0: 3fffdad0 00000000 3ffef0f4 402053fc
20:25:37.226 -> 3fffffc0: feefeffe feefeffe 3ffe8640 40100739
20:25:37.226 -> <<<stack<<<

20:25:37.261 -> ets Jan 8 2013,rst cause:2, boot mode:(1,6)