[SYCL][E2E] Fix Win path handling in lit config (#18135)

Fixes consequence of
4150bdf
f'"{path}"' converts empty string to the string with quotes and length
== 2 that breaks checks for not empty path. Fixes that.

Signed-off-by: Tikhomirova, Kseniya <kseniya.tikhomirova@intel.com>

Author: KseniyaTikhomirova

sycl/test-e2e/lit.cfg.py

@@ -251,7 +251,7 @@ def check_igc_tag_and_add_feature():
 
 def quote_path(path):
     if platform.system() == "Windows":
-        return f'"{path}"'
+        return f'"{path}"' if path else ""
     return shlex.quote(path)
 
 # Call the function to perform the check and add the feature