fix: graph() mutable default opts and bare except swallowing KeyboardInterrupt (#1509)

* fix: graph() mutable default opts and bare except swallowing KeyboardInterrupt

* ci: retrigger

---------

Co-authored-by: Mario Behling <mb@mariobehling.de>

Author: Jayantparashar10

py/visdom/__init__.py

@@ -3035,7 +3035,7 @@ def dual_axis_lines(self, X=None, Y1=None, Y2=None, opts=None, win=None, env=Non
 
     @pytorch_wrap
     def graph(
-        self, edges, edgeLabels=None, nodeLabels=None, opts=dict(), env=None, win=None
+        self, edges, edgeLabels=None, nodeLabels=None, opts=None, env=None, win=None
     ):
         """
         This function draws interactive network graphs. It takes list of edges as one of the arguments.
@@ -3057,9 +3057,10 @@ def graph(
                 * `height` : height of the Pane
                 * `width` : width of the Pane
         """
+        opts = {} if opts is None else opts
         try:
             import networkx as nx
-        except:
+        except ImportError:
             raise RuntimeError("networkx must be installed to plot Graph figures")
 
         G = nx.Graph()