Updates for latest Python debug adapter

They moved the location of the main application.

But also:

- ignore multiple responses for the same request
- ignore protocol violations for variablesReference (assume 0)
- ignore protocol violations for missing 'name' (assume basename of
path)

python3/vimspector/stack_trace.py

@@ -14,6 +14,7 @@
 # limitations under the License.
 
 import vim
+import os
 
 from vimspector import utils
 
@@ -196,6 +197,9 @@ class StackTraceView( object ):
       else:
         source = { 'name': '<unknown>' }
 
+      if 'name' not in source:
+        source[ 'name' ] = os.path.basename( source[ 'path' ] )
+
       line = utils.AppendToBuffer(
         self._buf,
         '  {0}: {1}@{2}:{3}'.format( frame[ 'id' ],