Handle no GSM location returned

Signed-off-by: Sara Damiano <sdamiano@stroudcenter.org>

examples/AllFunctions/AllFunctions.ino

@@ -420,6 +420,7 @@ void loop() {
 
 #if TINY_GSM_TEST_GPRS
   modem.gprsDisconnect();
+  delay(5000L);
   if (!modem.isGprsConnected()) {
     DBG("GPRS disconnected");
   } else {
@@ -454,6 +455,8 @@ void loop() {
   DBG("Poweroff.");
 #endif
 
+  DBG("End of tests.");
+
   // Do nothing forevermore
   while (true) {
     modem.maintain();

src/TinyGsmGSMLocation.tpp

@@ -90,7 +90,11 @@ class TinyGsmGSMLocation {
     //        4 = Get longitude latitude and date time
     thisModem().sendAT(GF("+CLBS=4,1"));
     // Should get a location code of "0" indicating success
-    if (thisModem().waitResponse(120000L, GF("+CLBS:0,")) != 1) {
+    if (thisModem().waitResponse(120000L, GF("+CLBS:")) != 1) { return false; }
+    int8_t locationCode = thisModem().streamGetIntLength(2);
+    // 0 = success, else, error
+    if (locationCode != 0) {
+      thisModem().waitResponse();  // should be an ok after the error
       return false;
     }