Correct ALDI with zero value

ALDI did not append anything to the alpha register if the value was 0, base was anything except decimal and zero-fill was inactive.
hth313 · May 12, 2020 · 3879ea8 · 3879ea8
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diff --git a/doc/ReleaseNotes.md b/doc/ReleaseNotes.md
@@ -40,6 +40,8 @@ Update to use OS4, May X, 2020.
   digit, ended digit entry and disabled stack lift. This has now been
   changed so that 0 is put in X and stack lift is disabled.
 
+* ALDI did not append anything to the alpha register if the value was
+  0, base was anything except decimal and zero-fill was inactive.
 
 ## Version 0C
 

diff --git a/src/ladybug.s b/src/ladybug.s
@@ -4160,6 +4160,8 @@ ALDI:         nop
 44$:          b=c     x             ; B.X= updated value
               ?st=1   Flag_ZeroFill
               goc     45$
+              ?c#0    m             ; last digit?
+              gonc    45$           ; yes, we always emit that one
               ?c#0    xs
               gonc    55$
               st=1    Flag_ZeroFill ; non-zero seen