Fix a segfault that became apparent with a 850 apt.dat file

src/Airports/apt_loader.cxx

@@ -478,6 +478,9 @@ private:
     int freqKhz = atoi(token[1].c_str());
     int rangeNm = 50;
     FGPositioned::Type ty;
+    // Make sure we only pass on stations with at least a name
+    if (token.size() >2){
+
         switch (lineId) {
             case 50:
                 ty = FGPositioned::FREQ_AWOS;
@@ -498,6 +501,8 @@ private:
 
         commStations.push_back(new flightgear::CommStation(token[2], ty, pos, rangeNm, freqKhz));
     }
+    else SG_LOG( SG_GENERAL, SG_DEBUG, "Found unnamed comm. Skipping: " << lineId);
+  }
 
 };