Support the bash debugger

This required working around some sort of bug where the server returns
an invalid content length. Either that or we are somehow processing the
same message twice with additional escaping? It's really strange.

python3/vimspector/code.py

@@ -57,20 +57,21 @@ class CodeView( object  ):
       self._signs[ 'vimspectorPC' ] = None
 
     if not frame or not frame[ 'source' ]:
-      return
+      return False
 
     vim.current.window = self._window
 
-    buffer_number = vim.eval( 'bufnr( "{0}", 1 )'.format(
-      frame[ 'source' ][ 'path' ]  ) )
+    buffer_number = int( vim.eval( 'bufnr( "{0}", 1 )'.format(
+      frame[ 'source' ][ 'path' ]  ) ) )
 
     try:
       vim.command( 'bu {0}'.format( buffer_number ) )
+      self._window.cursor = ( frame[ 'line' ], frame[ 'column' ] )
     except vim.error as e:
       if 'E325' not in str( e ):
-        raise
-
-    self._window.cursor = ( frame[ 'line' ], frame[ 'column' ] )
+        self._logger.exception(
+          'Unexpected error from vim: {0}'.format( str( e ) ) )
+        return False
 
     self._signs[ 'vimspectorPC' ] = self._next_sign_id
     self._next_sign_id += 1
@@ -80,6 +81,7 @@ class CodeView( object  ):
       frame[ 'line' ],
       frame[ 'source' ][ 'path' ] ) )
 
+    return True
 
   def Clear( self ):
     if self._signs[ 'vimspectorPC' ]: