Fixed a spurious warning message in the log

- when a Table or Plot viewer is running in the channel and one moves
  the cursor around in the Pan window

doc/WhatsNew.rst

@@ -7,6 +7,8 @@ Ver 5.2.0 (unreleased)
 - Substituted puremagic package for python-magic (works better across
   platforms)
 - Fixed an issue with the mouse wheel event scrolling MDI workspaces
+- Fixed a spurious warning when moving the cursor in the Pan plugin
+  window and a table or plot viewer is running in the channel
 
 Ver 5.1.0 (2024-05-22)
 ======================

ginga/rv/Control.py

@@ -2196,6 +2196,8 @@ def _select_viewer_cb(w, dct):
         wgts.table.set_tree(tree_dict)
         # highlight first choice
         path = [openers[0].name]
+        text = inspect.getdoc(openers[0].vclass)
+        wgts.descr.set_text(text)
         wgts.table.select_path(path)
 
         dialog = Widgets.Dialog(title="Choose viewer",
@@ -2737,27 +2739,32 @@ def _showxy(self, viewer, data_x, data_y):
         """
         self._cursor_last_update = time.time()
 
-        try:
-            image = viewer.get_vip()
-            if image.ndim < 2:
-                return
-
-            settings = viewer.get_settings()
-            info = image.info_xy(data_x, data_y, settings)
-
-            # Are we reporting in data or FITS coordinates?
-            off = self.settings.get('pixel_coords_offset', 0.0)
-            info.x += off
-            info.y += off
-            if 'image_x' in info:
-                info.image_x += off
-            if 'image_y' in info:
-                info.image_y += off
+        if not hasattr(viewer, 'get_vip'):
+            info = Bunch.Bunch(itype='base', data_x=data_x, data_y=data_y,
+                               x=data_x, y=data_y, value=None)
+        else:
+            try:
+                image = viewer.get_vip()
+                if image.ndim < 2:
+                    return
+
+                settings = viewer.get_settings()
+                info = image.info_xy(data_x, data_y, settings)
+
+                # Are we reporting in data or FITS coordinates?
+                off = self.settings.get('pixel_coords_offset', 0.0)
+                info.x += off
+                info.y += off
+                if 'image_x' in info:
+                    info.image_x += off
+                if 'image_y' in info:
+                    info.image_y += off
 
-        except Exception as e:
-            self.logger.warning(
-                "Can't get info under the cursor: %s" % (str(e)), exc_info=True)
-            return
+            except Exception as e:
+                self.logger.warning(
+                    "Can't get info under the cursor: %s" % (str(e)), exc_info=True)
+                info = Bunch.Bunch(itype='base', data_x=data_x, data_y=data_y,
+                                   x=data_x, y=data_y, value=None)
 
         # TODO: can this be made more efficient?
         chname = self.get_channel_name(viewer)