Merge pull request #561 from JanC/462-fix

Fix for undefined method `isa' for nil:NilClass (NoMethodError)

CHANGELOG.md

@@ -13,6 +13,9 @@
   [Dimitris Koutsogiorgas](https://github.com/dnkoutso)
   [#565](https://github.com/CocoaPods/Xcodeproj/pull/565)  
 
+* Fixed `undefined method isa for nil:NilClass` when deleting a Xcodeproj target.
+  [JanC](https://github.com/JanC)
+  [#462](https://github.com/CocoaPods/Xcodeproj/issues/462)
 
 ## 1.5.7 (2018-03-22)
 

lib/xcodeproj/project/object/configuration_list.rb

@@ -105,7 +105,11 @@ def target
         #---------------------------------------------------------------------#
 
         def ascii_plist_annotation
-          " Build configuration list for #{target.isa} \"#{target}\" "
+          if target.nil?
+            ' Build configuration list for <deleted target> '
+          else
+            " Build configuration list for #{target.isa} \"#{target}\" "
+          end
         end
       end
     end

spec/project/object/configuration_list_spec.rb

@@ -39,6 +39,10 @@ module ProjectSpecs
       @configuration_list.build_settings('Debug').should == settings
     end
 
+    it 'returns the ascii plist annotation given a deleted target ' do
+      @configuration_list.ascii_plist_annotation.should == ' Build configuration list for <deleted target> '
+    end
+
     it 'sets a build setting to the given value for all the configurations' do
       %w(Debug Release).each do |name|
         configuration = @project.new(XCBuildConfiguration)