Issue with Python libraries

#### Issue details
Hello, don't know if it was my unique problem or some bug during the update, but after automatic update to the newest version I had a problem with my python scripts.
I'm adding my anaconda libraries path to the sys.path at the start of the script. Then I was trying to import the python os library
`import os`
This gave an error: Error running script Odwołanie do obiektu nie zostało ustawione na wystąpienie obiektu. - that's in polish, but basically it is a System.NullReferenceException
During that the sys.path was:
`['.', 'C:\\Program Files (x86)\\Mission Planner\\Lib', 'C:\\Program Files (x86)\\Mission Planner\\DLLs', 'C:\\Program Files (x86)\\Mission Planner\\Lib.zip', 'C:\\Users\\Zbyszek\\Anaconda2\\Lib']`
but the first folder was missing - in the Mission Planner directory there was only the Lib.zip file, but it was not unpacked. The issue was fixed by unpacking the zip file manually.

I do not understand the nature of this issue, as I expected the os library to be imported from the Anaconda directory anyway, but I decided to report it in case it is some problem with the installation.

Before the today's update it was working correctly - the os library was imported, but I do not know if it was imported from Anaconda or if the Lib folder was existing in the Mission Planner directory.

#### Version
1.3.55

Start with the 1.3.55 automatic update and installation process that places Mission Planner's Lib.zip and Lib paths under C:\Program Files (x86)\Mission Planner. Reproduce the update, inspect whether Lib.zip is unpacked, and run a script containing `import os` with the shown Anaconda path. Done means a fresh update makes the embedded Python libraries available without manual extraction.

Written by the indexing model from the issue text.