Continue processing class when error on parent

Don't bail out on processing a class if an error is raised when
determining the parent class name.

lib/brakeman/processors/controller_processor.rb

@@ -30,8 +30,16 @@ class Brakeman::ControllerProcessor < Brakeman::BaseProcessor
     if @current_module
       name = (@current_module.to_s + "::" + name.to_s).to_sym
     end
+
+    begin
+      parent = class_name exp[2]
+    rescue StandardError => e
+      Brakeman.debug e
+      parent = nil
+    end
+
     @controller = { :name => name,
-                    :parent => class_name(exp[2]),
+                    :parent => parent,
                     :includes => [],
                     :public => {},
                     :private => {},

lib/brakeman/processors/library_processor.rb

@@ -30,8 +30,15 @@ class Brakeman::LibraryProcessor < Brakeman::BaseProcessor
     if @tracker.libs[name]
       @current_class = @tracker.libs[name]
     else
+      begin
+        parent = class_name exp[2]
+      rescue StandardError => e
+        Brakeman.debug e
+        parent = nil
+      end
+
       @current_class = { :name => name,
-                    :parent => class_name(exp[2]),
+                    :parent => parent,
                     :includes => [],
                     :public => {},
                     :private => {},

lib/brakeman/processors/model_processor.rb

@@ -22,8 +22,15 @@ class Brakeman::ModelProcessor < Brakeman::BaseProcessor
       Brakeman.debug "[Notice] Skipping inner class: #{class_name exp[1]}"
       ignore
     else
+      begin
+        parent = class_name exp[2]
+      rescue StandardError => e
+        Brakeman.debug e
+        parent = nil
+      end
+
       @model = { :name => class_name(exp[1]),
-        :parent => class_name(exp[2]),
+        :parent => parent,
         :includes => [],
         :public => {},
         :private => {},

test/apps/rails3.1/app/models/some_model.rb

+class SomeModel < @some_variable
+end

test/apps/rails3.1/lib/alib.rb

+class Alib < $SOME_CONSTANT
+end