[lldb] Skip TestAppleSimulatorOSType if json parsing fails

[augusto2112]

Summary

xcodebuild, which is invoked by the apple_simulator_test decorator, may
may return a successful status even if it was unable to run due to the
authorization agent denying it. This causes the TestAppleSimulatorOSType
to run when it shouldn't, and throw an excpection when parsing the JSON
that lists the simulators available. Wrap the json parsing in a
try/except block and if it fails, skip the ttest.

lldb/test/API/tools/lldb-server/TestAppleSimulatorOSType.py

class TestAppleSimulatorOSType(gdbremote_testcase.GdbRemoteTestCaseBase):
 
     # Number of stderr lines to read from the simctl output.
     READ_LINES = 10
 
     def check_simulator_ostype(self, sdk, platform_name, arch=platform.machine()):
         cmd = ['xcrun', 'simctl', 'list', '-j', 'devices']
         self.trace(' '.join(cmd))
         sim_devices_str = subprocess.check_output(cmd).decode("utf-8")
+
+        # xcodebuild, which is invoked by the apple_simulator_test decorator,
+        # may return a successful status even if it was unable to run due to 
+        # the authorization agent denying it. Try to parse the json that lists 
+        # the simulators but if that fails skip the test.
+        try:
             sim_devices = json.loads(sim_devices_str)['devices']
+        except json.decoder.JSONDecodeError:
+            self.skipTest("Could not parse JSON of simulators available")
+
         # Find an available simulator for the requested platform
         deviceUDID = None
         deviceRuntime = None
         for simulator in sim_devices:
             if isinstance(simulator,dict):
                 runtime = simulator['name']
                 devices = simulator['devices']
             else: