Ismo Puustinen 6372bb2f28 cluster/gce: fix checks for empty strings. ...

In order to use -n, the value needs either be quoted or [[ .. ]] block
has to be used. Fix the comparisons that way.

To verify, consider this (analogous) script:

  #!/bin/bash

  subnetwork_url=""

  if [ -n ${subnetwork_url} ]; then
    echo "foo"
  fi

  if [[ -n ${subnetwork_url} ]]; then
    echo "bar"
  fi

Here "foo" is echoed by the script, even though the variable
subnetwork_url has a zero-length value.

2018-03-23 15:37:03 +02:00

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