a←⎕ causes a VALUE ERROR when the user does not enter anything but presses "Enter"

[aplteam]

That can cause havoc in a user command.

In such a case it should repeat the prompt.

---

IDE:
Version: 4.5.4097
Electron: 26.6.9
Chrome: 116.0.5845.228
Node: 18.16.1
Platform: Win32
Date: 2024-02-23 15:24:25 +0100
Git commit: 9fb3136
Preferences:{
"autoCloseBrackets":"0",
"autoCompleteCharacterLimit":"0",
"autoPW":"1",
"autocompletionDelay":"150",
"colourScheme":"Kai",
"colourSchemes":"[{"name":"Kai","theme":"dark","styles":"asgn=fg:#ff9900 com=fg:b cur=bc:f00,fg:#ffffff dfn2=fg:#ff9900 dfn3=fg:#ff9900 dfn4=fg:#ff9900 dfn5=fg:#ff9900 dfn=fg:#ff9900 diam=fg:#ffffff err=fg:#ff00ff,bg:822,bgo:0.5 fn=fg:#ff9900 idm=fg:#ff9900 glb=fg:#00ffff kw=fg:#ffffff lbl=bg:642,bgo:0.5,fg:#ffffff lnum=fg:b94,bg:010,bgo:0 mtch=fg:0,bg:#ffffff,bgo:0 norm=fg:#ff9900,bg:0,bgo:1 num=fg:#ff9900 op1=fg:d95 op2=fg:#ff9900 sel=bg:#808080,bgo:1 semi=fg:8 sqbr=fg:#ff9900 srch=bgo:1,fg:0,bg:#ffffff str=fg:#00ff00 tc=bg:1,bgo:1 tcpe=bg:2,bgo:1 zld=fg:#ff9900 scmd=fg:#ff9900 ucmd=fg:f80 vtip=bg:733,fg:ff0,bgo:1,bc:900 vtt=bc:f80 ca=bg:828282,bgo:1,fg:0f0 cm=bg:0,bgo:1,fg:0f0 cv=bg:f,bgo:1,fg:0 cvv=bg:0,bgo:1,fg:0ff ma=bg:828282,bgo:1,fg:0ff na=bg:828282,bgo:1,fg:f qor=bg:f00,bgo:1,fg:f dc=bg:900,bgo:1 dfn1=fg:#ff9900 var=fg:#ff9900 cubr=fg:#ff9900 par=fg:#ff9900 itk=fg:#ff00ff ns=fg:#ff9900 trad=fg:#ff9900 quad=fg:#00ffff qdl=fg:#ff9900"}]",
"defaultConfig":"v19.0",
"doubleClickToEdit":"0",
"editWins":"{"width":2102,"height":1238,"x":4352,"y":-1002,"ox":0,"oy":0}",
"editWinsRememberPos":"1",
"floatSingle":"0",
"kbdLocale":"en_GB",
"keys":"{"AC":["Ctrl+F5"],"BH":["Shift+F6"],"BP":["Ctrl+F7"],"MA":["F6"],"NX":["F3"],"PV":["Ctrl+F3"],"RM":["Ctrl+F6"],"ZMI":["Ctrl+NumPad_Add"],"ZMO":["Ctrl+NumPad_Subtract"],"ZMR":["Ctrl+NumPad0"],"PF3":[],"PF6":[],"PF18":[],"PF27":[],"PF29":[],"PF30":[],"PF31":[]}",
"pauseOnError":"1",
"pfkeys":"["","","⎕trap←0 'S'","⊂NX","","→⎕LC","","","","⍝","⎕THIS","","","","","]ListObjects","]Latest","∘∘∘","","⎕TRAP","]Box off","","","","","","","","⊢⎕SE.Link.Expunge","","","","","]UDebug off","⍝TODO⍝","{{}(#.⎕NS'').(⎕ED⍠('ReadOnly' 1)&{'ed'}ed←⍵)}","","]Cider.","]Cider.OpenProject ","]Cider.ListOpenProjects","]Cider.CloseProject","","]Git.","]Git.Status","]Git.OpenGitShell","]Git.Commit -m \"\"","]Tatin.","]Tatin.ListPackages ","]Tatin.ListRegistries "]",
"presetsCreated":"["/opt/mdyalog/19.0/64/unicode/mapl","C:\\Program Files\\Dyalog\\Dyalog APL-64 18.2 Unicode\\dyalog.exe","C:\\Program Files\\Dyalog\\Dyalog APL-64 18.0 Unicode\\dyalog.exe","C:\\Program Files\\Dyalog\\Dyalog APL-64 20.0 Unicode\\dyalog.exe"]",
"selectionHighlight":"1",
"zoom":"2"
}

Interpreter:
Version: 19.0.50061
Platform: Windows-64
Edition: Unicode/64
Date: Sep 2 2024 at 09:04:33

[mkromberg]

(In other words, it should behave the same way that a "direct" interpreter session does).