Remove logspam for empty remote device properties

Some properties can have a length of zero, so don't display an error
message when this happens.

Bug: 37803501
Test: Code still compiles
Change-Id: If6a2f32505c61f31075b2fc87d0521020c3720ac
diff --git a/src/com/android/bluetooth/btservice/RemoteDevices.java b/src/com/android/bluetooth/btservice/RemoteDevices.java
index 46b856f..675c427 100644
--- a/src/com/android/bluetooth/btservice/RemoteDevices.java
+++ b/src/com/android/bluetooth/btservice/RemoteDevices.java
@@ -309,10 +309,7 @@
         for (int j = 0; j < types.length; j++) {
             type = types[j];
             val = values[j];
-            if (val.length <= 0)
-                errorLog("devicePropertyChangedCallback: bdDevice: " + bdDevice
-                        + ", value is empty for type: " + type);
-            else {
+            if (val.length > 0) {
                 synchronized(mObject) {
                     debugLog("Property type: " + type);
                     switch (type) {