(GH-871) Fix - Uninstall zip: Path is empty string

When calling Uninstall-ChocolateyZipPackage, the text file may have an
empty string at the end of the file. This line should be skipped and
not tried to remove. Even though the ErrorAction is to
SilentlyContinue, it will fail if the arguments are not correct.

src/chocolatey.resources/helpers/functions/UnInstall-ChocolateyZipPackage.ps1

@@ -65,8 +65,10 @@ param(
   if ((Test-Path -path $zipContentFile)) {
     $zipContentFile
     $zipContents=get-content $zipContentFile
-    foreach ($fileInZip in $zipContents) {
-      remove-item -Path "$fileInZip" -ErrorAction SilentlyContinue -Recurse -Force
+    foreach ($fileInZip in $zipContents) {   
+      if ($fileInZip -ne $null -and $fileInZip.Trim() -ne '') {
+        Remove-Item -Path "$fileInZip" -ErrorAction SilentlyContinue -Recurse -Force
+      }   
     }
   }
 }