Ensure b:showing_message is always defined.

diff --git a/autoload/flake8.vim b/autoload/flake8.vim
index 180bcadb920c24e3fd4855f61bd5b5adb6fb0572..15d061efee31d9eac5e11e68be273a594debcf16 100644 (file)
--- a/autoload/flake8.vim
+++ b/autoload/flake8.vim
@@ -273,6 +273,10 @@ function! s:ShowErrorMessage()  " {{{
     if !exists('s:resultDict')
        return
     endif
+    if !exists('b:showing_message')
+       " ensure showing msg is always defined
+       let b:showing_message = ' '
+    endif
 
     " if there is a message on the current line,
     " then echo it 
@@ -295,4 +299,3 @@ endfunction  " }}}
 
 let &cpo = s:save_cpo
 unlet s:save_cpo
-