fix more unbound variables

Signed-off-by: Eli Uriegas <[email protected]>

Author: seemethere

install_requirements.sh

@@ -10,7 +10,7 @@ set -eou pipefail
 # Install required python dependencies for developing
 # Dependencies are defined in .pyproject.toml
 PYTHON_EXECUTABLE=${PYTHON_EXECUTABLE:-python}
-if [[ -z $CONDA_DEFAULT_ENV ]] || [[ $CONDA_DEFAULT_ENV == "base" ]] || [[ ! -x "$(command -v python)" ]];
+if [[ -z ${CONDA_DEFAULT_ENV:-} ]] || [[ ${CONDA_DEFAULT_ENV:-} == "base" ]] || [[ ! -x "$(command -v python)" ]];
 then
   PYTHON_EXECUTABLE=python3
 fi