add launchpad bug reports without comments

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+cache-miss-rate / Invalid JSON
+
+Hi,
+
+We have VMs which were started with an older version than qemu 2.1 which added "cache-miss-rate" property for XBZRLECacheStats. While trying to migrate the VM to a new host which is running a higher version (2.3) of Qemu we got an exception:
+
+virJSONValueFromString:1642 : internal error: cannot parse json {"return": {"expected-downtime": 1, "xbzrle-cache": {"bytes": 0, "cache-size": 67108864, "cache-miss-rate": -nan, "pages": 0, "overflow": 0, "cache-miss": 8933}, "status": "active", "disk": {"total": 429496729600, "dirty-sync-count": 0, "remaining": 193896382464, "mbps": 0, "transferred": 235600347136, "duplicate": 0, "dirty-pages-rate": 0, "skipped": 0, "normal-bytes": 0, "normal": 0}, "setup-time": 13, "total-time": 1543124, "ram": {"total": 8599183360, "dirty-sync-count": 4, "remaining": 30695424, "mbps": 830.636997, "transferred": 3100448901, "duplicate": 1358341, "dirty-pages-rate": 7, "skipped": 0, "normal-bytes": 3082199040, "normal": 752490}}, "id": "libvirt-186200"}: lexical error: malformed number, a digit is required after the minus sign.
+          67108864, "cache-miss-rate": -nan, "pages": 0, "overflow": 0
+                     (right here) ------^
+
+virNetClientStreamRaiseError:191 : stream aborted at client request
+
+
+Would it be possible to improve the JSON parser to skip the key if the value is incorrect instead of throwing an exception? Then hopefully qemu 2.3 or higher is able to handle the data without this property, falling back to its default.
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