grond go: improve error handling

docs/source/files/gnss.yaml

@@ -0,0 +1,30 @@
+--- !pf.gnss.GNSSCampaign
+name: northridge
+stations:
+- !pf.gnss.GNSSStation
+  lat: 18.30
+  lon: -74.22
+  elevation: 0.0
+  depth: 0.0
+  code: ANGL
+  style: static
+  north: !pf.gnss.GNSSComponent
+    unit: m
+    shift: 5.7e-06
+    sigma: 5.7e-06
+  east: !pf.gnss.GNSSComponent
+    unit: m
+    shift: -7e-07
+    sigma: 8.8e-06
+  up: !pf.gnss.GNSSComponent
+    unit: m
+    shift: 2.93e-05
+    sigma: 1.11e-05
+  correlation_ne: 0.002
+  correlation_eu: 0.0
+  correlation_nu: 0.0
+- !pf.gnss.GNSSStation
+  lat: 18.28
+  lon: -74.23
+  # ...
+  # (add more station information in the same manner) 

src/apps/grond.py

@@ -446,15 +446,19 @@ def command_go(args):
 
     parser, options, args = cl_parse('go', args, setup)
 
-    env = Environment(args)
+    try:
+        env = Environment(args)
 
-    grond.go(
-        env.get_config(),
-        event_names=env.get_selected_event_names(),
-        force=options.force,
-        preserve=options.preserve,
-        status=options.status,
-        nparallel=options.nparallel)
+        grond.go(
+            env.get_config(),
+            event_names=env.get_selected_event_names(),
+            force=options.force,
+            preserve=options.preserve,
+            status=options.status,
+            nparallel=options.nparallel)
+
+    except grond.GrondError as e:
+        die(str(e))
 
 
 def command_forward(args):