Relocate platform check

[istvans-mn]

Platform check before the first meteorological descriptor, even if the value is missing.

[github-actions]

API Unit Test Coverage Report

File	Stmts	Miss	Cover	Missing
\_\_init\_\_.py	0	0	100%
datastore_pb2.py	64	52	19%	24–75
datastore_pb2_grpc.py	43	23	47%	37–52, 85–87, 92–94, 99–101, 106–108, 112–136, 174, 191, 208, 225
grpc_getter.py	20	11	45%	15–16, 20–23, 27–29, 33–35
locustfile.py	15	15	0%	1–31
main.py	37	6	84%	41, 46, 56–57, 67–68
metadata_endpoints.py	52	23	56%	41–50, 54, 71–145, 149
response_classes.py	5	0	100%
utilities.py	80	22	72%	15, 33, 40, 62–65, 73–84, 89–96, 116, 120, 122
custom_geo_json
edr_feature_collection.py	6	0	100%
formatters
\_\_init\_\_.py	11	0	100%
covjson.py	53	1	98%	75
geojson.py	15	2	87%	17, 42
routers
\_\_init\_\_.py	0	0	100%
edr.py	98	6	94%	129, 137, 247–248, 307–308
feature.py	46	19	59%	75–108, 124–129, 135–157
TOTAL	545	180	67%

API Unit Test Coverage Summary

Tests	Skipped	Failures	Errors	Time
23	0 💤	0 ❌	0 🔥	1.981s ⏱️