Fix NoneType has no attribute get
If volume_type is None and then create volumes with allow-multiattach,
Cinder-schduler will raise error:
AttributeError: 'NoneType' object has no attribute 'get'
Change-Id: Ied42d13b642617dd239ea92c019354b90657821a
Closes-bug: #1683431
(cherry picked from commit a58f66e180
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@ -297,7 +297,8 @@ class FilterScheduler(driver.Scheduler):
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# Since Cinder is using mixed filters from Oslo and it's own, which
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# takes 'resource_XX' and 'volume_XX' as input respectively, copying
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# 'volume_XX' to 'resource_XX' will make both filters happy.
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volume_type = resource_type = request_spec.get("volume_type")
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volume_type = request_spec.get("volume_type")
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resource_type = request_spec.get("volume_type", {})
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config_options = self._get_configuration_options()
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