Don't throw error on empty reply

Sometimes, the server reply can be empty and still valid. This is for
example the case with time table replies when there are no departures
from a station (or at least not any departures matching the selected
direction).

Fixes smurfy#267.

src/parser/parser_resrobot.cpp

@@ -376,17 +376,17 @@ void ParserResRobot::parseTimeTable(QNetworkReply *networkReply)
     QByteArray allData = networkReply->readAll();
 //    qDebug() << "Reply:\n" << allData;
 
-    QVariantMap doc = parseJson(allData).toMap();
-    if (doc.isEmpty()) {
+    QVariant reply = parseJson(allData);
+    if (!reply.isValid()) {
         emit errorOccured(tr("Cannot parse reply from the server"));
         return;
     }
-
+    QVariantMap replyMap = reply.toMap();
     QVariantList departures;
     if (timetableSearchMode == Arrival)
-        departures = doc.value("Arrival").toList();
+        departures = replyMap.value("Arrival").toList();
     else
-        departures = doc.value("Departure").toList();
+        departures = replyMap.value("Departure").toList();
     TimetableEntriesList timetable;
     foreach (QVariant departureData, departures) {
         TimetableEntry resultItem;
@@ -439,12 +439,13 @@ void ParserResRobot::parseStationsByName(QNetworkReply *networkReply)
     QByteArray allData = networkReply->readAll();
 //    qDebug() << "Reply:\n" << allData;
 
-    QVariantMap doc = parseJson(allData).toMap();
-    if (doc.isEmpty()) {
+    QVariant reply = parseJson(allData);
+    if (!reply.isValid()) {
         emit errorOccured(tr("Cannot parse reply from the server"));
         return;
     }
-    QVariantList stations = doc.value("StopLocation").toList();
+    QVariantMap replyMap = reply.toMap();
+    QVariantList stations = replyMap.value("StopLocation").toList();
     StationsList result;
     foreach (QVariant stationData, stations) {
         const QVariantMap& station = stationData.toMap();
@@ -464,13 +465,13 @@ void ParserResRobot::parseStationsByCoordinates(QNetworkReply *networkReply)
     QByteArray allData = networkReply->readAll();
 //    qDebug() << "Reply:\n" << allData;
 
-    QVariantMap doc = parseJson(allData).toMap();
-    if (doc.isEmpty()) {
+    QVariant reply = parseJson(allData);
+    if (!reply.isValid()) {
         emit errorOccured(tr("Cannot parse reply from the server"));
         return;
     }
-
-    QVariantList stations = doc.value("StopLocation").toList();
+    QVariantMap replyMap = reply.toMap();
+    QVariantList stations = replyMap.value("StopLocation").toList();
     StationsList result;
     foreach (QVariant stationData, stations) {
         const QVariantMap& station = stationData.toMap();
@@ -490,15 +491,15 @@ void ParserResRobot::parseSearchJourney(QNetworkReply *networkReply)
     QByteArray allData = networkReply->readAll();
 //    qDebug() << "Reply:\n" << allData;
 
-    QVariantMap doc = parseJson(allData).toMap();
-    if (doc.isEmpty()) {
+    QVariant reply = parseJson(allData);
+    if (!reply.isValid()) {
         emit errorOccured(tr("Cannot parse reply from the server"));
         return;
     }
-
-    searchEarlierReference = doc.value("scrB").toString();
-    searchLaterReference = doc.value("scrF").toString();
-    QVariantList journeyListData = doc.value("Trip").toList();
+    QVariantMap replyMap = reply.toMap();
+    searchEarlierReference = replyMap.value("scrB").toString();
+    searchLaterReference = replyMap.value("scrF").toString();
+    QVariantList journeyListData = replyMap.value("Trip").toList();
 
     cachedResults.clear();