Mixers: raise exception when geom file is incomplete

pylint format

src/modules/systemlib/mixer/geoms/quad_x.toml

@@ -13,7 +13,7 @@ Cm        = 0.05
 
 [[rotors]]
 name      = "front_right"
-position  = [0.707107, 0.707107, 0.0]
+position  = [0.707107, 0.707107]#, 0.0]
 direction = "CCW"
 
 [[rotors]]

src/modules/systemlib/mixer/geoms/tools/px_generate_mixers.py

@@ -68,8 +68,6 @@ def parse_geom_toml(filename):
     Parses toml geometry file and returns a dictionary with curated list of rotors
     '''
 
-    import toml
-
     # Load toml file
     d = toml.load(filename)
 
@@ -79,6 +77,16 @@ def parse_geom_toml(filename):
     else:
         default = {}
 
+    # Check info section
+    if 'info' not in d:
+        raise AttributeError('{}: Error, missing info section'.format(filename))
+
+    # Check info section
+    for field in ['name', 'key', 'description']:
+        if field not in d['info']:
+            raise AttributeError('{}: Error, unspecified info field "{}"'.format(filename, field))
+
+
     # Convert rotors
     rotor_list = []
     if 'rotors' in d:
@@ -89,13 +97,21 @@ def parse_geom_toml(filename):
                     if field in default:
                         r[field] = default[field]
                     else:
-                        print(filename + ': Error, unspecified field ' + field + ' for rotor ' + r['name'])
+                        raise AttributeError('{}: Error, unspecified field "{}" for rotor "{}"'
+                                             .format(filename, field, r['name']))
 
-            # Check fields
+            # Check direction field
             r['direction'] = r['direction'].upper()
             if r['direction'] not in ['CW', 'CCW']:
-                print(filename + ': Error, invalid direction value "' + r['direction'] + '" for rotor ' + r['name'])
+                raise AttributeError('{}: Error, invalid direction value "{}" for rotor "{}"'
+                                     .format(filename, r['direction'], r['name']))
 
+            # Check vector3 fields
+            for field in ['position', 'axis']:
+                if len(r[field]) != 3:
+                    raise AttributeError('{}: Error, field "{}" for rotor "{}"'
+                                         .format(filename, field, r['name']) +
+                                         ' must be an array of length 3')
 
             # Add rotor to list
             rotor_list.append(r)