Make sure we still support parsing config without ADB tunnels

Author: pimterry

app/build.gradle

@@ -48,7 +48,7 @@ dependencies {
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     implementation 'androidx.localbroadcastmanager:localbroadcastmanager:1.0.0'
     implementation 'me.dm7.barcodescanner:zxing:1.9.13'
-    implementation 'com.beust:klaxon:5.0.1'
+    implementation 'com.beust:klaxon:5.5'
     implementation 'com.squareup.okhttp3:okhttp:4.3.0'
     implementation 'com.google.android.material:material:1.1.0-beta02'
     implementation 'net.swiftzer.semver:semver:1.1.1'

app/src/main/java/tech/httptoolkit/android/ProxyDetails.kt

@@ -4,6 +4,7 @@ import android.os.Parcelable
 import android.util.Base64
 import android.util.Log
 import com.beust.klaxon.Converter
+import com.beust.klaxon.Json
 import com.beust.klaxon.JsonValue
 import kotlinx.android.parcel.Parcelize
 import java.io.ByteArrayInputStream
@@ -32,6 +33,7 @@ data class ProxyInfo(
      * direct network connection, since it's dependent on the ADB server, but it's a useful fallback
      * especially if the proxy computer has a firewall or the network blocks connections.
      */
+    @Json(serializeNull = false)
     val localTunnelPort: Int?,
 
     /**