Merge pull request #17 from apache/obermeier-patch-1

[STREAMPIPES-477] CLI logs service optional
diff --git a/cli/bin/commands/logs b/cli/bin/commands/logs
index 39b378c..b317e66 100755
--- a/cli/bin/commands/logs
+++ b/cli/bin/commands/logs
@@ -40,12 +40,11 @@
     case $1 in
         -f|--follow)
           if [ -n "$2" ] && [ ${2:0:1} != "-" ]; then
-            follow=true
             svc=$2
-            shift 2
-          else
-            fatal "Argument for $1 is missing" >&2
+            shift 1
           fi
+          follow=true
+          shift 1
           ;;
         -*|--*=) fatal "Unsupported flag $1, see 'streampipes ${0##*/} --help'" >&2 ;;
         *)