More error checking

git-svn-id: https://svn.thoughtbot.com/plugins/paperclip/trunk@183 7bbfaf0e-4d1d-0410-9690-a8bb5f8ef2aa

lib/paperclip.rb

@@ -314,13 +314,18 @@ module Thoughtbot #:nodoc:
       def make_thumbnail attachment, orig_io, geometry
         operator = geometry[-1,1]
         geometry, crop_geometry = geometry_for_crop(geometry, orig_io) if operator == '#'
+        begin
           command = "convert - -scale '#{geometry}' #{operator == '#' ? "-crop '#{crop_geometry}'" : ""} -"
+          ActiveRecord::Base.logger.info("Thumbnail: '#{command}'")
           thumb = IO.popen(command, "w+") do |io|
             orig_io.rewind
             io.write(orig_io.read)
             io.close_write
             StringIO.new(io.read)
           end
+        rescue SystemCallError => e
+          raise PaperclipError.new(attachment, "Error creating thumbnail. #{e}")
+        end
         if ::Thoughtbot::Paperclip.options[:whiny_thumbnails]
           raise PaperclipError.new(attachment, "Convert returned with result code #{$?.exitstatus}: #{thumb.read}") unless $?.success?
         end