Fix NPE in "is refreshing progress bar"

app/build.gradle

@@ -74,10 +74,12 @@ dependencies {
 
     compile 'com.github.yukuku:ambilwarna:2.0.1'
 
+    compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'
     compile 'dnsjava:dnsjava:2.1.7'
     compile 'org.apache.commons:commons-lang3:3.4'
     compile 'org.apache.commons:commons-collections4:4.1'
     provided 'org.projectlombok:lombok:1.16.10'
+
     // for tests
     testCompile 'junit:junit:4.12'
     testCompile 'com.squareup.okhttp3:mockwebserver:3.4.1'

app/src/main/java/at/bitfire/davdroid/ui/AccountActivity.java

@@ -425,14 +425,14 @@ public class AccountActivity extends AppCompatActivity implements Toolbar.OnMenu
                 if (Services.SERVICE_CARDDAV.equals(service)) {
                     info.carddav = new AccountInfo.ServiceInfo();
                     info.carddav.id = id;
-                    info.carddav.refreshing = davService.isRefreshing(id) || ContentResolver.isSyncActive(account, ContactsContract.AUTHORITY);
+                    info.carddav.refreshing = (davService != null && davService.isRefreshing(id)) || ContentResolver.isSyncActive(account, ContactsContract.AUTHORITY);
                     info.carddav.hasHomeSets = hasHomeSets(db, id);
                     info.carddav.collections = readCollections(db, id);
 
                 } else if (Services.SERVICE_CALDAV.equals(service)) {
                     info.caldav = new AccountInfo.ServiceInfo();
                     info.caldav.id = id;
-                    info.caldav.refreshing = davService.isRefreshing(id) ||
+                    info.caldav.refreshing = (davService != null && davService.isRefreshing(id)) ||
                             ContentResolver.isSyncActive(account, CalendarContract.AUTHORITY) ||
                             ContentResolver.isSyncActive(account, TaskProvider.ProviderName.OpenTasks.authority);
                     info.caldav.hasHomeSets = hasHomeSets(db, id);

dav4android

@@ -1 +1 @@
-Subproject commit 9a334f69c781be37bd26eca3f18734c5f6826a8e
+Subproject commit 05065af8ef4a73f831b51bc7766af885cc4735d3