Error handling/throwing for non-existant resources

[Denperidge]

When requesting a resource that doesn't exist, mu-cl-resources seems to return a generic internal server error. It might be useful for a proper error to be returned if possible!

resources_1           | [2023-03-23 15:24:58 [ERROR]] Condition MU-CL-RESOURCES::NO-SUCH-INSTANCE was signalled.
resources_1           | Backtrace for: #<SB-THREAD:THREAD "hunchentoot-worker-192.168.64.8:33245" RUNNING {1006CBF7F3}>
resources_1           | 0: (TRIVIAL-BACKTRACE:PRINT-BACKTRACE-TO-STREAM #<SB-IMPL::STRING-OUTPUT-STREAM {1006D354E3}>)
resources_1           | 1: (HUNCHENTOOT::GET-BACKTRACE)
resources_1           | 2: ((FLET "H0" :IN HUNCHENTOOT:HANDLE-REQUEST) #<MU-CL-RESOURCES::NO-SUCH-INSTANCE {1006D35373}>)
resources_1           | 3: (SB-KERNEL::%SIGNAL #<MU-CL-RESOURCES::NO-SUCH-INSTANCE {1006D35373}>)
resources_1           | 4: (ERROR MU-CL-RESOURCES::NO-SUCH-INSTANCE :RESOURCE #<MU-CL-RESOURCES::RESOURCE {100808CFA3}> :ID "b8380ac-b99e-11ed-bbf2-0242ac1b0003" :TYPE "agenda-items")
resources_1           | 5: (MU-CL-RESOURCES::FIND-RESOURCE-FOR-UUID-THROUGH-SPARQL #<MU-CL-RESOURCES::ITEM-SPEC {1006D1F2E3}>)
resources_1           | 6: (MU-CL-RESOURCES::FIND-RESOURCE-FOR-UUID-THROUGH-CACHE-OR-SPARQL #<MU-CL-RESOURCES::ITEM-SPEC {1006D1F2E3}>)
resources_1           | 7: ((:METHOD MU-CL-RESOURCES::NODE-URL (MU-CL-RESOURCES::ITEM-SPEC)) #<MU-CL-RESOURCES::ITEM-SPEC {1006D1F2E3}>) [fast-method]
resources_1           | 8: (MU-CL-RESOURCES::CACHE-OBJECT #<MU-CL-RESOURCES::ITEM-SPEC {1006D1F2E3}>)
resources_1           | 9: (MU-CL-RESOURCES::CACHE-LIST-CALL #<MU-CL-RESOURCES::RESOURCE {100808CFA3}>)
resources_1           | 10: ((:METHOD MU-CL-RESOURCES::LIST-CALL (MU-CL-RESOURCES::RESOURCE)) #<MU-CL-RESOURCES::RESOURCE {100808CFA3}>) [fast-method]
resources_1           | 11: ((LAMBDA (MU-CL-RESOURCES::BASE-PATH) :IN "/app/framework/call-specification.lisp") "agenda-items")
resources_1           | 12: ((LAMBDA NIL :IN MU-SUPPORT::MK-RESPONSE-METHOD))
resources_1           | 13: ((:METHOD HUNCHENTOOT:HANDLE-REQUEST (HUNCHENTOOT:ACCEPTOR HUNCHENTOOT:REQUEST)) #<HUNCHENTOOT:EASY-ACCEPTOR (host *, port 80)> #<HUNCHENTOOT:REQUEST {1006D1BF53}>) [fast-method]
resources_1           | 14: ((:METHOD HUNCHENTOOT:PROCESS-REQUEST (T)) #<HUNCHENTOOT:REQUEST {1006D1BF53}>) [fast-method]
resources_1           | 15: (HUNCHENTOOT::DO-WITH-ACCEPTOR-REQUEST-COUNT-INCREMENTED #<HUNCHENTOOT:EASY-ACCEPTOR (host *, port 80)> #<CLOSURE (LAMBDA NIL :IN HUNCHENTOOT:PROCESS-CONNECTION) {1006D1B30B}>)
resources_1           | 16: ((:METHOD HUNCHENTOOT:PROCESS-CONNECTION (HUNCHENTOOT:ACCEPTOR T)) #<HUNCHENTOOT:EASY-ACCEPTOR (host *, port 80)> #<USOCKET:STREAM-USOCKET {1006CBE943}>) [fast-method]
resources_1           | 17: ((:METHOD HUNCHENTOOT:PROCESS-CONNECTION :AROUND (HUNCHENTOOT:ACCEPTOR T)) #<HUNCHENTOOT:EASY-ACCEPTOR (host *, port 80)> #<USOCKET:STREAM-USOCKET {1006CBE943}>) [fast-method]
resources_1           | 18: ((FLET HUNCHENTOOT::PROCESS-CONNECTION% :IN HUNCHENTOOT::HANDLE-INCOMING-CONNECTION%) #<HUNCHENTOOT:EASY-ACCEPTOR (host *, port 80)> #<USOCKET:STREAM-USOCKET {1006CBE943}>)
resources_1           | 19: ((LAMBDA NIL :IN BORDEAUX-THREADS::BINDING-DEFAULT-SPECIALS))
resources_1           | 20: ((FLET SB-UNIX::BODY :IN SB-THREAD::INITIAL-THREAD-FUNCTION-TRAMPOLINE))
resources_1           | 21: ((FLET "WITHOUT-INTERRUPTS-BODY-4" :IN SB-THREAD::INITIAL-THREAD-FUNCTION-TRAMPOLINE))
resources_1           | 22: ((FLET SB-THREAD::WITH-MUTEX-THUNK :IN SB-THREAD::INITIAL-THREAD-FUNCTION-TRAMPOLINE))
resources_1           | 23: ((FLET "WITHOUT-INTERRUPTS-BODY-1" :IN SB-THREAD::CALL-WITH-MUTEX))
resources_1           | 24: (SB-THREAD::CALL-WITH-MUTEX #<CLOSURE (FLET SB-THREAD::WITH-MUTEX-THUNK :IN SB-THREAD::INITIAL-THREAD-FUNCTION-TRAMPOLINE) {7FEBA39D6CDB}> #<SB-THREAD:MUTEX "thread result lock" owner: #<SB-THREAD:THREAD "hunchentoot-worker-192.168.64.8:33245" RUNNING {1006CBF7F3}>> NIL T NIL)
resources_1           | 25: (SB-THREAD::INITIAL-THREAD-FUNCTION-TRAMPOLINE #<SB-THREAD:THREAD "hunchentoot-worker-192.168.64.8:33245" RUNNING {1006CBF7F3}> NIL #<CLOSURE (LAMBDA NIL :IN BORDEAUX-THREADS::BINDING-DEFAULT-SPECIALS) {1006CBF79B}> NIL)
resources_1           | 26: ("foreign function: call_into_lisp")
resources_1           | 27: ("foreign function: new_thread_trampoline")