Pass unhandled messages up to the cloud

Currently these DTHs return null when they parse a message that they
don't have specific handling for.  This ends up sending the message up
to the cloud as an event, which prevented us from potentially parsing
that message in the cloud.  By instead returning an empty map we can
instead send the message up to the cloud to be parsed there.  This
allows us to add handling in the cloud for new message without requiring
and AppEngine deploy for them to work.

This resolves: https://smartthings.atlassian.net/browse/DPROT-200

devicetypes/smartthings/smartsense-motion.src/smartsense-motion.groovy

@@ -44,7 +44,7 @@ metadata {
 }
 
 def parse(String description) {
-	def results
+	def results = [:]
 	if (isZoneType19(description) || !isSupportedDescription(description)) {
 		results = parseBasicMessage(description)
 	}
@@ -57,21 +57,25 @@ def parse(String description) {
 
 private Map parseBasicMessage(description) {
 	def name = parseName(description)
-	def value = parseValue(description)
-	def linkText = getLinkText(device)
-	def descriptionText = parseDescriptionText(linkText, value, description)
-	def handlerName = value
-	def isStateChange = isStateChange(device, name, value)
+	if (name != null) {
+		def value = parseValue(description)
+		def linkText = getLinkText(device)
+		def descriptionText = parseDescriptionText(linkText, value, description)
+		def handlerName = value
+		def isStateChange = isStateChange(device, name, value)
 
-	def results = [
-		name: name,
-		value: value,
-		linkText: linkText,
-		descriptionText: descriptionText,
-		handlerName: handlerName,
-		isStateChange: isStateChange,
-		displayed: displayed(description, isStateChange)
-	]
+		def results = [
+				name           : name,
+				value          : value,
+				linkText       : linkText,
+				descriptionText: descriptionText,
+				handlerName    : handlerName,
+				isStateChange  : isStateChange,
+				displayed      : displayed(description, isStateChange)
+		]
+	} else {
+		results = [:]
+	}
 	log.debug "Parse returned $results.descriptionText"
 	return results
 }