Synchronisation now shouldn't fail if the trusted host has no new messages

- fixed tests for Gradle builds
- fixed SerializationTest

networking/build.gradle

@@ -15,5 +15,6 @@ dependencies {
     testCompile 'junit:junit:4.11'
     testCompile 'org.slf4j:slf4j-simple:1.7.12'
     testCompile 'org.mockito:mockito-core:1.10.19'
+    testCompile project(path: ':domain', configuration: 'testArtifacts')
     testCompile project(':security-bc')
 }