Merge branch 'aboellinger-aboellinger-patch-1'

Author: nerdvegas

src/rez/pip.py

@@ -202,6 +202,9 @@ def find_pip_from_context(python_version, pip_version=None):
 
     py_exe = find_python_in_context(context)
 
+    if not py_exe:
+        return None, None, context
+
     proc = context.execute_command(
         # -E and -s are used to isolate the environment as much as possible.
         # See python --help for more details. We absolutely don't want to get