don't throw exception if multi outline setup fails

This could be a side effect of one of the micro feeders not having created an
outline, yet, or of folders being moved around or some other temporal issue.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

src/modules/adsb-feeder/filesystem/root/opt/adsb/adsb-setup/push_multioutline.py

@@ -7,7 +7,11 @@
 
 
 n = make_int(sys.argv[1] if len(sys.argv) > 1 else 1)
-mo_data = MultiOutline().create(n)
+try:
+    mo_data = MultiOutline().create(n)
+except:
+    print_err("failed to MultiOutline class - maybe just a timing issue?")
+    exit(1)
 
 # now we need to inject this into the stage2 tar1090
 with TemporaryDirectory(prefix="/tmp/adsb") as tmpdir:

src/modules/adsb-feeder/filesystem/root/opt/adsb/adsb-setup/utils/multioutline.py

@@ -19,14 +19,23 @@ def _get_outlines(self, num):
 
     def create(self, num):
         data = self._get_outlines(num)
+        num = len(data)
         result = {"multiRange": []}
         polygons = []
         for i in range(len(data)):
-            polygons.append(
-                Polygon(shell=LinearRing(data[i]["actualRange"]["last24h"]["points"]))
-            )
+            try:
+                polygons.append(
+                    Polygon(
+                        shell=LinearRing(data[i]["actualRange"]["last24h"]["points"])
+                    )
+                )
+            except:
+                num -= 1
+                print(
+                    f"can't create linear ring from outline #{i} - maybe there is no data, yet?"
+                )
         made_change = True
-        look_at = range(1, len(data))
+        look_at = range(1, num)
         while made_change:
             made_change = False
             to_consider = [0]