Edited Issue: [0.3.x] unhandled exception after use bp with dbgCommand [14061]

```
0:000> !py
Python 2.7.13 (v2.7.13:a06454b1afa1, Dec 17 2016, 20:53:40) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> dbgCommand("bp ntdll!NtCreateFile \"!py C:/temp/test.py\"")
>>> go()
ModLoad: 00007fff`c1280000 00007fff`c1405000 C:\WINDOWS\SYSTEM32\PROPSYS.dll
ModLoad: 00007fff`c7820000 00007fff`c78bf000 C:\WINDOWS\System32\clbcatq.dll
pykd.executionStatus.Break
>>> quit()
c0000005 Exception in pykd.py debugger extension.
PC: 00007fff`af415a90 VA: 00000000`00000000 R/W: 0 Parameter: 00000000`00000000

```