Empty PushMagic string in TokenUpdate message

We recently noticed that, In the TokenUpdate message from a MDM enrolled device, the PushMagic value is empty. The response from device is:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>MessageType</key>
	<string>TokenUpdate</string>
	<key>PushMagic</key>
	<string></string>
	<key>Token</key>
	<string>[redacted]</string>
	<key>Topic</key>
	<string>[redacted]</string>
	<key>UDID</key>
	<string>[redacted]</string>
</dict>
</plist>

This is a MacBookPro9,2 with OS version 10.8.5. We would like to understand whether this is an issue. Or how to handle this.