BUG: Avoid crashing when line list is removed

CHANGES.rst

@@ -43,6 +43,9 @@ Specviz
 Bug Fixes
 ---------
 
+- Line Lists plugin no longer crashes when a list is removed under
+  certain conditions. [#1318]
+
 Cubeviz
 ^^^^^^^
 

jdaviz/configs/default/plugins/line_lists/line_lists.py

@@ -772,8 +772,11 @@ def vue_remove_list(self, listname):
         self.list_contents = {k: v for k, v in self.list_contents.items() if k != listname}
         row_inds = [i for i, ln in
                     enumerate(self._viewer.spectral_lines['listname'])
-                    if ln == listname]
-        self._viewer.spectral_lines.remove_rows(row_inds)
+                    if ln != listname]
+        if len(row_inds) == 0:
+            self._viewer.spectral_lines = None
+        else:
+            self._viewer.spectral_lines = self._viewer.spectral_lines[row_inds]
 
     def vue_remove_line(self, line, erase=True):
         """

jdaviz/configs/default/plugins/line_lists/tests/test_line_lists.py

@@ -73,6 +73,14 @@ def test_redshift(specviz_helper, spectrum1d):
                                    'obs_new': 5508})
     assert_allclose(line['obs'], 5508)
 
+    # https://github.com/spacetelescope/jdaviz/issues/1168
+    ll_plugin.vue_set_identify(('Test List', line, 0))
+    ll_plugin.vue_remove_list('Test List')
+    assert ll_plugin._viewer.spectral_lines is None
+
+    # TODO: The label is cleared in GUI but fails this test.
+    # assert ll_plugin.identify_label == ''
+
 
 def test_line_identify(specviz_helper, spectrum1d):
     label = "Test 1D Spectrum"