Gracefully handle failed realtime data requests

			for my $eva (@related_stations) {

				push( @realtime_reqs, $self->get_realtime_p( $eva, $dt_req ) );

			}

			return $self->{promise}->all(@realtime_reqs);

			return $self->{promise}->all_settled(@realtime_reqs);

		}

	)->then(

		sub {

			my @realtime_results = @_;

			for my $realtime_result (@realtime_results) {

				if ( $realtime_result->{status} eq 'rejected' ) {

					$self->{warnstr} //= q{};

					$self->{warnstr}

					  .= "Realtime data request failed: $realtime_result->{reason}. ";

				}

			}

			$self->postprocess_results;

			$promise->resolve($self);

			return;