Improved warning message stack trace for unexpected error (#145)

lux/core/frame.py

@@ -22,6 +22,7 @@
 from lux.utils.utils import check_import_lux_widget
 from typing import Dict, Union, List, Callable
 import warnings
+import traceback
 import lux
 
 
@@ -684,13 +685,14 @@ def on_button_clicked(b):
 
         except (KeyboardInterrupt, SystemExit):
             raise
-        except:
+        except Exception:
             warnings.warn(
                 "\nUnexpected error in rendering Lux widget and recommendations. "
-                "Falling back to Pandas display.\n\n"
-                "Please report this issue on Github: https://github.com/lux-org/lux/issues ",
+                "Falling back to Pandas display.\n"
+                "Please report the following issue on Github: https://github.com/lux-org/lux/issues \n",
                 stacklevel=2,
             )
+            warnings.warn(traceback.format_exc())
             display(self.display_pandas())
 
     def display_pandas(self):