Remove blank codes

These codes stem from services which are either ECS - no public stops which means no code (sometimes these are errornously given codes on the diagram), or are cancelled in the timetable - stops cannot be confirmed.

Signed-off-by: Fred Boniface <fred@fjla.uk>

pis/gw.yaml

@@ -2730,10 +2730,6 @@ pis:
     stops: [rdg,tlh,pan,gor,cho,did]
   - code: "0455"
     stops: [rdg,the,tha,nby]
-  - code: "0392"
-    stops: []
-  - code: "0390"
-    stops: []
   - code: "1022"
     stops: [did,cho,gor,pan,tlh,rdg]
   - code: "1140"
@@ -2748,20 +2744,10 @@ pis:
     stops: [ply,ivy,tot,nta,tgm,dwl,exd,tvp,tau,bwt,wsm,bri]
   - code: "1657"
     stops: [bpw,nwp,cdf]
-  - code: "0321"
-    stops: []
-  - code: "1146"
-    stops: []
   - code: "1156"
     stops: [did,rad,oxf]
-  - code: "0250"
-    stops: []
-  - code: "1711"
-    stops: []
   - code: "1646"
     stops: [rdg,the,amt,mdg,tha,nrc,nby,kit,hgd,bdw]
-  - code: "0199"
-    stops: []
   - code: "0465"
     stops: [nby,tha,the,rdg]
   - code: "0318"