[Bug 1582301] Re: [SRU]fix crash when suspend & resume when using WWAN with PIN set on SIM

[Aron Xu]

** Description changed:

+ [Impact]
+ There is a rate of crash when doing suspend and resume test when using WWAN with PIN set on SIM.
+ 
+ [Test Case]
+ With WWAN enabled, and have PIN set on SIM, doing stress test of suspend & resume, some crash may be observed in network-manager.
+ 
+ Also the e.u.c should no longer receive the same crash reports after
+ installing the update.
+ 
+ [Regression Potential]
+ The fix is checking a pointer before loop traverse which should be fair safe.
+ 
+ --------------
+ Original report:
+ 
  The Ubuntu Error Tracker has been receiving reports about a problem
  regarding network-manager-applet.  This problem was most recently seen
  with version 1.2.0-0ubuntu0.16.04.1, the problem page at
  https://errors.ubuntu.com/problem/e2c7668fff4fd9f50cb38d0308d51153640d5386
  contains more details.

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https://bugs.launchpad.net/bugs/1582301

Title:
  [SRU]fix crash when suspend & resume when using WWAN with PIN set on
  SIM

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