Groovy code doesn't work if I'm adding if condition

I have the below piece of code which is not working, but once I'm removing the if condition it returns the expected result

import groovy.json.JsonSlurper

def Imageslist = []

def arr = []
def sout = new StringBuilder(), serr = new StringBuilder()
def b = new StringBuffer()

def number=1

if (number>0){
def command = [ 'bash', '-c', "curl --silent -X GET -H 'Accept: application/vnd.docker.distribution.manifest.v2+json' -u user:pass http://XXXXX:XXXX/v2/_catalog" ]}

def proc = command.execute()
proc.consumeProcessErrorStream(b)

arr=proc.in.text

The current code returns me null, but if I'll remove the if condition, I'll get the required result.