Fix gprbuild gpr_paths setup

self.gpr_paths was checked instead of gpr_paths.

Co-authored-by: David SAUVAGE - AdaLabs Ltd <[email protected]>

Author: Jicquel

gprproject/gprbuild.py

@@ -116,7 +116,7 @@ def __init__(
         self.gnatcov = gnatcov
         self.symcc = symcc
         self.gpr_paths: list[str] = []
-        if self.gpr_paths:
+        if gpr_paths:
             self.gpr_paths = list(gpr_paths)
         else:
             self.gpr_paths = []