[UI] Ensure printing a path does not raise

CHANGELOG.md

@@ -51,6 +51,10 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
   [Daniel Tomlinson](https://github.com/dantoml)
   [#5250](https://github.com/CocoaPods/CocoaPods/issues/5250)
 
+* Ensure attempting to print a path in the error report doesn't itself error.  
+  [Samuel Giddins](https://github.com/)
+  [#5541](https://github.com/CocoaPods/CocoaPods/issues/5541)
+
 
 ## 1.0.1 (2016-06-02)
 

lib/cocoapods/user_interface.rb

@@ -184,7 +184,11 @@ module Pod
         if pathname
           from_path = config.podfile_path.dirname if config.podfile_path
           from_path ||= Pathname.pwd
-          path = Pathname(pathname).relative_path_from(from_path)
+          path = begin
+                   Pathname(pathname).relative_path_from(from_path)
+                 rescue
+                   pathname
+                 end
           "`#{path}`"
         else
           ''