catch ENOENT

These can occur because of, for example, dangling symlinks, which are
the engine's responsibility.

Author: wfleming

lib/cc/engine/analyzers/analyzer_base.rb

@@ -6,6 +6,7 @@ module Analyzers
       class Base
         RESCUABLE_ERRORS = [
           ::CC::Engine::Analyzers::ParserError,
+          ::Errno::ENOENT,
           ::Racc::ParseError,
         ]