NO-JIRA: ensure empty lines are skipped while processing env files in check-params-env.sh (#1784)

This solves the issues in https://github.com/opendatahub-io/notebooks/actions/runs/16837438136/job/47700268773

triggered by introduction of empty lines in `params-latest.env` in

* #1730

```
Checking that all variables in the file 'manifests/base/params.env' & 'manifests/base/params-latest.env' are unique and expected
Some of the variables in the file aren't unique!
```

```
Checking that all values assigned to variables in the file 'manifests/base/params.env' & 'manifests/base/params-latest.env' are unique and expected
Some of the values in the file aren't unique!
```

```
Checking that there are expected number of records in the file 'manifests/base/params.env' + 'manifests/base/params-latest.env'
Number of records in the file is incorrect - expected '44' but got '75'!
```

```
Checking format of: ''
ERROR: Line doesn't contain '=' and it should!
```

Author: jiridanek

ci/check-params-env.sh

@@ -52,7 +52,7 @@ function check_variables_uniq() {
     echo "Checking that all variables in the file '${env_file_path_1}' & '${env_file_path_2}' are unique and expected"
 
     local content
-    content=$(sed 's#\(.*\)=.*#\1#' "${env_file_path_1}"; sed 's#\(.*\)=.*#\1#' "${env_file_path_2}" | sort)
+    content=$(sed '/^$/d' "${env_file_path_1}" "${env_file_path_2}" | sed 's#\(.*\)=.*#\1#' | sort)
 
     local num_records
     num_records=$(echo "${content}" | wc -l)
@@ -69,7 +69,7 @@ function check_variables_uniq() {
     if test "${allow_value_duplicity}" = "false"; then
         echo "Checking that all values assigned to variables in the file '${env_file_path_1}' & '${env_file_path_2}' are unique and expected"
 
-        content=$(sed 's#\(.*\)=.*#\1#' "${env_file_path_1}"; sed 's#\(.*\)=.*#\1#' "${env_file_path_2}" | sort)
+        content=$(sed '/^$/d' "${env_file_path_1}" "${env_file_path_2}" | sed 's#\(.*\)=.*#\1#' | sort)
 
         local num_values
         num_values=$(echo "${content}" | wc -l)
@@ -589,6 +589,9 @@ check_variables_uniq "${PARAMS_ENV_PATH}" "${PARAMS_LATEST_ENV_PATH}" "false" "t
 process_file() {
     local_ret_code=0
     while IFS= read -r LINE; do
+        # If the line is empty, skip to the next one
+        [[ -z "$LINE" ]] && continue
+
         echo "Checking format of: '${LINE}'"
         [[ "${LINE}" = *[[:space:]]* ]] && {
             echo "ERROR: Line contains white-space and it shouldn't!"