Merge branch 'master' into issue-4

Author: Jochen Schalanda

pom.xml

@@ -14,7 +14,7 @@
 
     <groupId>org.graylog.plugins</groupId>
     <artifactId>usage-statistics</artifactId>
-    <version>1.0.6</version>
+    <version>1.0.7-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>Graylog Usage Statistics Plugin</name>

src/main/java/org/graylog/plugins/usagestatistics/UsageStatsMetaData.java

@@ -24,7 +24,7 @@
 import java.util.Set;
 
 public class UsageStatsMetaData implements PluginMetaData {
-    public static final Version VERSION = new Version(1, 0, 6);
+    public static final Version VERSION = new Version(1, 0, 7);
 
     @Override
     public String getUniqueId() {

src/main/java/org/graylog/plugins/usagestatistics/dto/MacAddress.java

@@ -30,6 +30,9 @@ public abstract class MacAddress {
     private static final Pattern PATTERN = Pattern.compile("[0-9a-f]{2}([:-][0-9a-f]{2}){5}", Pattern.CASE_INSENSITIVE);
 
     public static MacAddress create(String macAddress) {
+        if(macAddress == null || macAddress.isEmpty()) {
+            return EMPTY;
+        }
         checkArgument(PATTERN.matcher(macAddress).matches());
 
         return new AutoValue_MacAddress(macAddress.substring(0, 8));