Added basic validation for location input

cmd/client/advanced.go

@@ -37,8 +37,20 @@ func advancedMenu(app *application) {
 			}
 			fmt.Printf("\nChanged units from %s to %s...\n\n", current, app.Config.Units)
 		} else if option == "2" {
-			getPreciseLocation(app)
-			getCurrent(app)
+
+			var validLoc bool
+			for !validLoc {
+				getPreciseLocation(app)
+				getCurrent(app)
+
+				if app.Forecast.Main.Temp != 0.00 {
+					validLoc = true
+				} else {
+					fmt.Println("I couldn't get any information for that location.")
+					fmt.Println("Are you sure the coordinates are valid?")
+				}
+			}
+
 			printWeather(app)
 		}
 	}