Only call clang-format if file is not empty (google#189)

Signed-off-by: Wolfgang E. Sanyer <WolfgangSanyer@Google.com>

Author: ezzieyguywuf

autoload/codefmt/clangformat.vim

@@ -129,6 +129,11 @@ function! codefmt#clangformat#GetFormatter() abort
   ""
   " Reformat buffer with clang-format, only targeting [ranges] if given.
   function l:formatter.FormatRanges(ranges) abort
+    if  line('$') == 1 && getline(1) == ''
+      " If the buffer is completely empty, there's nothing to do
+      return
+    endif
+
     let l:Style_value = s:plugin.Flag('clang_format_style')
     if type(l:Style_value) is# type('')
       let l:style = l:Style_value

vroom/clangformat.vroom

@@ -181,3 +181,10 @@ current buffer.
 
 The -assume-filename arg passed above is also related, used by the clang-format
 tool to detect any custom style rules particular to the current file.
+
+
+Bug #102. When the buffer is empty, clang-format does _not_ return a cursor
+position
+
+  @clear
+  :FormatCode clang-format