Handle failing to connect to server during login.

app/src/main/java/at/bitfire/davdroid/journalmanager/JournalAuthenticator.java

@@ -31,7 +31,7 @@ public class JournalAuthenticator {
         }
     }
 
-    public String getAuthToken(String username, String password) throws Exceptions.HttpException {
+    public String getAuthToken(String username, String password) throws Exceptions.HttpException, IOException {
         FormBody.Builder formBuilder = new FormBody.Builder()
                 .add("username", username)
                 .add("password", password);
@@ -41,19 +41,13 @@ public class JournalAuthenticator {
                 .url(remote)
                 .build();
 
-        try {
-            Response response = client.newCall(request).execute();
-            if (response.isSuccessful()) {
-                return GsonHelper.gson.fromJson(response.body().charStream(), AuthResponse.class).token;
-            } else if (response.code() == HttpURLConnection.HTTP_BAD_REQUEST) {
-                throw new Exceptions.UnauthorizedException("Username or password incorrect");
-            } else {
-                throw new Exceptions.HttpException(response);
-            }
-        } catch (IOException e) {
-            App.log.log(Level.SEVERE, "Couldn't download external resource", e);
+        Response response = client.newCall(request).execute();
+        if (response.isSuccessful()) {
+            return GsonHelper.gson.fromJson(response.body().charStream(), AuthResponse.class).token;
+        } else if (response.code() == HttpURLConnection.HTTP_BAD_REQUEST) {
+            throw new Exceptions.UnauthorizedException("Username or password incorrect");
+        } else {
+            throw new Exceptions.HttpException(response);
         }
-
-        return null;
     }
 }

app/src/main/java/at/bitfire/davdroid/ui/setup/BaseConfigurationFinder.java

@@ -10,6 +10,7 @@ package at.bitfire.davdroid.ui.setup;
 import android.content.Context;
 import android.support.annotation.NonNull;
 
+import java.io.IOException;
 import java.io.Serializable;
 import java.net.URI;
 import java.util.HashMap;
@@ -59,7 +60,7 @@ public class BaseConfigurationFinder {
         String authtoken = null;
         try {
             authtoken = authenticator.getAuthToken(credentials.userName, credentials.password);
-        } catch (Exceptions.HttpException e) {
+        } catch (Exceptions.HttpException|IOException e) {
             log.warning(e.getMessage());
 
             failed = true;