GraphParseError does not print name of non-family namespace that caused error

[uwagura]

Description

In version 8.3.3 of cylc, GraphParseError does not include the name of the namespace that produced the error

Reproducible Example

Run a command like cylc graph . on the following workflow:

[scheduling]
    [[graph]]
            R1 = "prep => not-fam:succeed-all => final"
[runtime]
    [[prep]]
    [[not-fam]]
    [[final]]

Expected Behaviour

The above workflow will give you an error that says

GraphParseError: family trigger on non-family namespace {expr}

When I believe that it should say

GraphParseError: family trigger on non-family namespace not-fam

I think this error is just caused by a missing f in the following format string. Although it is a small issue, I thought I'd let the development team know just in case the issue occurs in other places as well.

cylc-flow/cylc/flow/graph_parser.py

Lines 644 to 648 in cadf1ef

	# Not a family.
	if trig in self.__class__.fam_to_mem_trigger_map:
	raise GraphParseError(
	"family trigger on non-family namespace {expr}")

[oliver-sanders]

Closed by #6332