Fixing uncaught 'InvalidModulePath' exception

When we can't determine a valid module path, we throw an
exception, but weren't catching it in node visitor. This resulted
in Bandit erroring out if you run it against, for example,
setup.py in its own directory. This is certainily an edge-case
but catching exceptions is good.

Change-Id: I1a91670b398ca70c906bdd5be749105754cd7ff1

bandit/core/node_visitor.py

@@ -19,6 +19,7 @@ import copy
 
 import tester as b_tester
 import utils as b_utils
+from utils import InvalidModulePath
 
 
 class StatementBuffer():
@@ -158,7 +159,13 @@ class BanditNodeVisitor(ast.NodeVisitor):
             self.logger, self.config, self.results, self.testset, self.debug
         )
 
-        self.namespace = b_utils.get_module_qualname_from_path(fname)
+        # in some cases we can't determine a qualified name
+        try:
+            self.namespace = b_utils.get_module_qualname_from_path(fname)
+        except InvalidModulePath:
+            self.logger.info('Unable to find qualified name for module: {}'
+                             .format(self.fname))
+            self.namespace = ""
         self.logger.debug('Module qualified name: {}'.format(self.namespace))
         self.stmt_buffer = StatementBuffer()
         self.statement = {}