don't throw an exception for a metadata field out of place

Some vendors who generate QTI put all the same meta data values
in all the metadata places. This isn't valid, but can just be
ignored instead of killing the whole converstion process

closes #6807

Change-Id: I60e6d2eda99d463198e9c40d3636410f7eedb9a5
Reviewed-on: https://gerrit.instructure.com/7918
Tested-by: Hudson <hudson@instructure.com>
Reviewed-by: Brian Palmer <brianp@instructure.com>

lib/imsqtiv1.py

@@ -3109,7 +3109,7 @@ def __init__(self,name,attrs,parent):
 		self.lang=None
 		self.label=None
 		self.entry=None
-		self.CheckLocation((QTIMetadata),"<qtimetadatafield>")
+		self.CheckLocation((QTIMetadata),"<qtimetadatafield>", False)
 		self.ParseAttributes(attrs)
 
 	def SetAttribute_xml_lang (self,value):