Exiftool processing should ignore warnings

16:38:52,206 ERROR [EventServiceImpl] Exception during binaryMetadataSyncListener sync listener execution, continuing to run other listeners
org.nuxeo.binary.metadata.api.BinaryMetadataException: org.codehaus.jackson.JsonParseException: Unexpected character ('W' (code 87)): expected a valid value (number, String, array, object, 'true', 'false' or 'null')
 at [Source: java.io.StringReader@7a0c4f08; line: 1, column: 2]
	at org.nuxeo.binary.metadata.internals.ExifToolProcessor.readMetadata(ExifToolProcessor.java:141)
	at org.nuxeo.binary.metadata.internals.ExifToolProcessor.readMetadata(ExifToolProcessor.java:149)
	at org.nuxeo.binary.metadata.internals.BinaryMetadataServiceImpl.readMetadata(BinaryMetadataServiceImpl.java:65)
	at org.nuxeo.binary.metadata.internals.BinaryMetadataServiceImpl.writeMetadata(BinaryMetadataServiceImpl.java:190)
	at org.nuxeo.binary.metadata.internals.BinaryMetadataServiceImpl.writeMetadata(BinaryMetadataServiceImpl.java:165)
	at org.nuxeo.binary.metadata.internals.BinaryMetadataServiceImpl.handleUpdate(BinaryMetadataServiceImpl.java:250)
	at org.nuxeo.binary.metadata.internals.BinaryMetadataServiceImpl.handleSyncUpdate(BinaryMetadataServiceImpl.java:231)
	at org.nuxeo.binary.metadata.internals.listeners.BinaryMetadataSyncListener.handleEvent(BinaryMetadataSyncListener.java:59)
	at org.nuxeo.ecm.core.event.impl.EventServiceImpl.fireEvent(EventServiceImpl.java:242)
	at org.nuxeo.ecm.core.api.AbstractSession.notifyEvent(AbstractSession.java:272)
	at org.nuxeo.ecm.core.api.AbstractSession.saveDocument(AbstractSession.java:1444)
	at org.nuxeo.ecm.webapp.contentbrowser.DocumentActionsBean.updateDocument(DocumentActionsBean.java:240)
	at org.nuxeo.ecm.webapp.contentbrowser.DocumentActionsBean.updateDocument(DocumentActionsBean.java:264)
	at org.nuxeo.ecm.webapp.contentbrowser.DocumentActionsBean.updateCurrentDocument(DocumentActionsBean.java:270)
Caused by: org.codehaus.jackson.JsonParseException: Unexpected character ('W' (code 87)): expected a valid value (number, String, array, object, 'true', 'false' or 'null')
 at [Source: java.io.StringReader@7a0c4f08; line: 1, column: 2]
	at org.codehaus.jackson.JsonParser._constructError(JsonParser.java:1291)
	at org.codehaus.jackson.impl.JsonParserMinimalBase._reportError(JsonParserMinimalBase.java:385)
	at org.codehaus.jackson.impl.JsonParserMinimalBase._reportUnexpectedChar(JsonParserMinimalBase.java:306)
	at org.codehaus.jackson.impl.ReaderBasedParser._handleUnexpectedValue(ReaderBasedParser.java:628)
	at org.codehaus.jackson.impl.ReaderBasedParser.nextToken(ReaderBasedParser.java:362)
	at org.codehaus.jackson.map.ObjectMapper._initForReading(ObjectMapper.java:2428)
	at org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java:2385)
	at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1598)
	at org.nuxeo.binary.metadata.internals.ExifToolProcessor.returnResultMap(ExifToolProcessor.java:171)
	at org.nuxeo.binary.metadata.internals.ExifToolProcessor.readMetadata(ExifToolProcessor.java:137)
	... 114 more

exiftool -m -G -json -IPTC:Source -IPTC:CopyrightNotice -IPTC:Description /tmp/nxblob-667306342854244865.jpg  

Warning: Invalid EXIF text encoding for UserComment - /tmp/nxblob-667306342854244865.jpg
[{
  "SourceFile": "/tmp/nxblob-667306342854244865.jpg"
}]