camera.close() should be in a finally block to make sure that we don't

run out of resources because of failed camera initializations

platypush/plugins/camera/pi.py

@@ -124,6 +124,9 @@ class CameraPiPlugin(CameraPlugin):
 
         """
 
+        camera = None
+
+        try:
             camera = self._get_camera(**opts)
             image_file = os.path.abspath(os.path.expanduser(image_file))
 
@@ -141,9 +144,10 @@ class CameraPiPlugin(CameraPlugin):
 
             if preview:
                 camera.stop_preview()
-
-        camera.close()
             return {'image_file': image_file}
+        finally:
+            if camera:
+                camera.close()
 
     @action
     def capture_sequence(self, n_images, directory, name_format='image_%04d.jpg', preview=False, warmup_time=2,
@@ -179,6 +183,9 @@ class CameraPiPlugin(CameraPlugin):
 
         """
 
+        camera = None
+
+        try:
             camera = self._get_camera(**opts)
             directory = os.path.abspath(os.path.expanduser(directory))
 
@@ -204,8 +211,9 @@ class CameraPiPlugin(CameraPlugin):
             if preview:
                 camera.stop_preview()
 
-        camera.close()
             return {'image_files': images}
+        finally:
+            camera.close()
 
     @action
     def start_time_lapse(self, directory, n_images=None, interval=0, warmup_time=2,