Handle missing removers

gimp.xml

 <?xml version="1.0" encoding="UTF-8"?>
 
 <packages>
-<package id="gimp" name="GNU Image Manipulation Program" revision="%version%.1" reboot="false" priority="20">
+<package id="gimp" name="GNU Image Manipulation Program" revision="%version%.2" reboot="false" priority="20">
   <variable name="version" value="2.8.14" />
 
   <check type="uninstall" condition="exists" path="GIMP %version%" />
@@ -12,10 +12,12 @@
   
 	<remove cmd='"%PROGRAMFILES%\GIMP-2.0\unins\unins000.exe" /VERYSILENT /NORESTART' >
     <exit code="1" />
+    <exit code="-1" />
 	</remove>
 
 	<remove cmd='cmd /c rmdir /s /q "%PROGRAMFILES%\GIMP-2.0"'>		
 	<exit code="1" />
+	<exit code="2" />
 	</remove>
 
 </package>