scanspool: Detect empty files

see #288

doc/pod/news.pod

@@ -124,6 +124,10 @@ Jesse Rehmer for the bug report and Bo Lindbergh for the fix.
 
 =item *
 
+B<scanspool> now detects empty files in a tradspool news spool.
+
+=item *
+
 B<innd> no longer malfunctions nor throttles when the maximum number of file
 descriptors supported by the system is reached.  If needing to use more file
 descriptors than the default system limit, a new C<LARGE_FD_SETSIZE> option

frontends/scanspool.in

@@ -415,10 +415,11 @@ sub check_spool {
             next;
         }
 
+        @group = ();
+
         # read until the Newsgroups header field is found
       AREADLINE:
         while ($aline = <$ARTICLE>) {
-
             # catch the Newsgroups header field
             if ($aline =~ /^Newsgroups:\w*\W/io) {
                 # convert $aline into a comma separated list of groups
@@ -460,6 +461,11 @@ sub check_spool {
             }
         }
 
+        if (scalar(@group) == 0) {
+            problem("WARNING: $filename: no Newsgroups header field "
+                  . "(empty file)");
+        }
+
         # close the article
         close $ARTICLE;
     }