added first size check

tm/obsw_tm_service_3.py

@@ -127,12 +127,15 @@ class Service3TM(PusTelemetry):
 
     def handle_thermal_sensor_hk_data(self):
         self.numberOfParameters = 2
+        if len(self._tm_data) < 13:
+            LOGGER.error("Format of thermal sensor HK data might be invalid!")
+            return
+
         self.hkHeader = ["Temperature", "Error Byte"]
         temperature_celcius = struct.unpack('!f', self._tm_data[8:12])[0]
         error_byte = self._tm_data[12]
         self.hkContent = [temperature_celcius, error_byte]
         self.validity_buffer = self._tm_data[13:]
-        print(self.validity_buffer)
 
     def handle_gyro_hk_data(self):
         pass