Null dereference within EsrevenAdapter::GetProcessList

[sentry]

Sentry Issue: BINARYNINJA-61

EXC_BAD_ACCESS / KERN_INVALID_ADDRESS / 0x0: Fatal Error: EXC_BAD_ACCESS / KERN_INVALID_ADDRESS / 0x0
  File "unique_lock.h", line 40, in unique_lock
  File "unique_lock.h", line 39, in unique_lock
  File "rspconnector.cpp", line 313, in BinaryNinjaDebugger::RspConnector::TransmitAndReceive
  File "esrevenadapter.cpp", line 2498, in BinaryNinjaDebugger::EsrevenAdapter::GetProcessList
  File "ffi.cpp", line 186, in BNDebuggerGetProcessList
...
(54 additional frame(s) were not displayed)

@bdash says:

EsrevenAdapter::GetProcessList dereferences m_rspConnector unconditionally. Other methods in the same class null check it before using it.

[xusheng6]

Fixed in #1077