Fixes being able to load a flamer tank with no flamer unit #18191

Job	Run time
Lint with OpenDream	46s
Compile Maps	47s
Find Maps to Test	11s
Run Linters	1m 50s
Windows Build	1m 38s
Alternate Tests (515, 1610, lv624) / run_unit_tests	56s
Unit Tests (almayer) / run_unit_tests	1m 7s
Unit Tests (bigredv2) / run_unit_tests	1m 25s
Unit Tests (chinook) / run_unit_tests	1m 12s
Unit Tests (corsat) / run_unit_tests	1m 13s
Unit Tests (fiorina_sciannex) / run_unit_tests	55s
Unit Tests (desert_dam) / run_unit_tests	59s
Unit Tests (kutjevo) / run_unit_tests	1m 21s
Unit Tests (ice_colony_v2) / run_unit_tests	1m 11s
Unit Tests (lv522_chances_claim) / run_unit_tests	1m 15s
Unit Tests (new_varadero) / run_unit_tests	55s
Unit Tests (lv624) / run_unit_tests	58s
Unit Tests (prison_station_fop) / run_unit_tests	58s
Unit Tests (runtime) / run_unit_tests	1m 16s
Unit Tests (shivas_snowball) / run_unit_tests	58s
Unit Tests (sorokyne_strata) / run_unit_tests	1m 0s
Unit Tests (whiskey_outpost_v2) / run_unit_tests	59s
Check Alternate Tests	0s
	23m 50s

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