has_local_position_ned_cov variable is not set during intialization

[petrlmat]

Variable

mavros/mavros/src/plugins/local_position.cpp

Line 90 in e0e0b37

bool has_local_position_ned_cov;

is never initialized to false. As a result, if the mavlink message mavlink::common::msg::LOCAL_POSITION_NED_COV is not coming, the local position is not published due to the check in

mavros/mavros/src/plugins/local_position.cpp

Line 133 in e0e0b37

if (!has_local_position_ned_cov) {

The same problem could concern the variable

mavros/mavros/src/plugins/local_position.cpp

Line 89 in e0e0b37

bool has_local_position_ned;

which is not initialized either.