csfilter-kfp: handle lines consisting of white-spaces only

... as empty lines

Related: https://issues.redhat.com/browse/OSH-755
Closes: csutils#206

src/csfilter-kfp

@@ -113,7 +113,7 @@ def construct_path_filter(args):
     cmd += '  re=\n'
     cmd += '  while read line; do\n'
     cmd += '    re="${re}|(${line})"\n'
-    cmd += '  done < <(grep -Esv \'^(#|$)\' "$ep")\n'
+    cmd += '  done < <(grep -Esv \'^(#| *$)\' "$ep")\n'
     cmd += '  if test -n "$re"; then\n'
     cmd += '    csgrep --mode=json --invert-match --path="${re#|}"\n'
     cmd += '  else\n'

tests/csfilter-kfp/0002-stdout.txt

@@ -13,7 +13,7 @@ path_filter() {
   re=
   while read line; do
     re="${re}|(${line})"
-  done < <(grep -Esv '^(#|$)' "$ep")
+  done < <(grep -Esv '^(#| *$)' "$ep")
   if test -n "$re"; then
     csgrep --mode=json --invert-match --path="${re#|}"
   else

tests/csfilter-kfp/0004-kfp/WALinuxAgent/exclude-paths.txt

@@ -1,4 +1,4 @@
-
+ 
 WALinuxAgent[^/]*/dcr/.*
 # dcr' is a testing pipeline for WALA and it is packaged by an oversight, the code is not used. It was removed in the current upstream so this will be gone with WALA rebase.