zapit:CFrontend::setInput return if satposition not found

Origin commit data
------------------
Commit: 8adee6f281
Author: Jacek Jendrzej <overx300@gmail.com>
Date: 2019-12-29 (Sun, 29 Dec 2019)

src/zapit/src/frontend.cpp

@@ -1677,6 +1677,9 @@ void CFrontend::setInput(t_satellite_position satellitePosition, uint32_t freque
 {
 	sat_iterator_t sit = satellites.find(satellitePosition);
 
+	if (sit == satellites.end()){
+		return;
+	}
 	/* unicable uses diseqc parameter for input selection */
 	config.uni_lnb = sit->second.diseqc;