fixed bash error for non-existing volumes

Author: Bart Sjerps

asmdisks.spec

@@ -1,6 +1,6 @@
 Name:		asmdisks
 Summary:	Replacement for Oracle ASMLib using UDEV
-Version:	1.4.7.3
+Version:	1.4.7.4
 Release:	1%{?dtap}
 BuildArch:	noarch
 License:	GPLv3+

src/bin/asm

@@ -316,8 +316,10 @@ listvol() {
     dev=$(readlink -f /dev/"$vol")
     read bytes < <(lsblk -nbdo size "$dev")
     read size < <(bc <<< "scale=1;$bytes/1073741824")
+    printvol "${vol//oracleasm\//}" "${dev:--}" "$(devtype $dev)" "${size:--}"
+  else
+    printvol "${vol//oracleasm\//}" "${dev:--}" "-" "${size:--}"
   fi
-  printvol "${vol//oracleasm\//}" "${dev:--}" "$(devtype $dev)" "${size:--}"
 }
 
 listvols() {