Catch case with no sound devices and set plugin to disabled

jdaviz/configs/cubeviz/plugins/sonify_data/sonify_data.py

@@ -54,10 +54,11 @@ def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self._plugin_description = 'Sonify a data cube'
         self.docs_description = 'Sonify a data cube using the Strauss package.'
-        if not self.has_strauss:
+        if not self.has_strauss or len(sd.default.device) < 1:
             self.disabled_msg = ('To use Sonify Data, install strauss and restart Jdaviz. You '
                                  'can do this by running `pip install .[strauss]` in the command'
-                                 ' line and then launching Jdaviz.')
+                                 ' line and then launching Jdaviz. Currently, this plugin only works'
+                                 'on devices with valid sound output.')
 
         else:
             devices, indexes = self.build_device_lists()

jdaviz/configs/cubeviz/plugins/tools.py

@@ -11,7 +11,6 @@
 from jdaviz.core.tools import PanZoom, BoxZoom, _MatchedZoomMixin
 from jdaviz.configs.default.plugins.tools import ProfileFromCube
 
-
 __all__ = []
 
 ICON_DIR = os.path.join(os.path.dirname(__file__), '..', '..', '..', 'data', 'icons')