lib.pkg_relations: Beautify exceptions

In pkg_relations(), pass dependent_package to Dependency.parse_deps_spec()
for better error reporting.

Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/cmds/projects/lib/pkg_relations.py

@@ -67,6 +67,7 @@ def pkg_relations(
                 for dep in Dependency.parse_deps_spec(
                         deps_spec,
                         lookup_version = app.get_version,
+                        dependent_package = cur_pkg,
                 ):
                     dep_name = dep.base_name
                     if dep_name in ignore or dep.full_name in ignore: