change prompt color to magenta

src/repl.jl

@@ -252,7 +252,11 @@ function parse(cmd::String; for_completions=false)
     word_groups = group_words(words)
     # create statements
     if for_completions
-        return _statement(word_groups[end])
+        if length(word_groups) > 0
+            return _statement(word_groups[end])
+        else
+            return []
+        end
     end
     return map(Statement, word_groups)
 end
@@ -712,7 +716,7 @@ end
 # Set up the repl Pkg REPLMode
 function create_mode(repl, main)
     matrix_mode = LineEdit.Prompt(promptf;
-        prompt_prefix = Base.text_colors[:blue],
+        prompt_prefix = Base.text_colors[:magenta],
         prompt_suffix = "",
         complete = MatrixCompletionProvider(),
         sticky = true)