Fix code review issues: properly trim password values

Co-authored-by: felickz <1760475+felickz@users.noreply.github.com>

Author: Copilot

src/main/java/org/owasp/benchmark/helpers/LDAPManager.java

@@ -62,9 +62,15 @@ protected Hashtable<Object, Object> createEnv() {
 
         // Load password from environment variable or system property
         String ldapPassword = System.getenv("LDAP_ADMIN_PASSWORD");
-        if (ldapPassword == null || ldapPassword.trim().isEmpty()) {
+        if (ldapPassword != null) {
+            ldapPassword = ldapPassword.trim();
+        }
+        if (ldapPassword == null || ldapPassword.isEmpty()) {
             ldapPassword = System.getProperty("ldap.admin.password");
-            if (ldapPassword == null || ldapPassword.trim().isEmpty()) {
+            if (ldapPassword != null) {
+                ldapPassword = ldapPassword.trim();
+            }
+            if (ldapPassword == null || ldapPassword.isEmpty()) {
                 System.err.println(
                         "WARNING: Using default LDAP password. Set LDAP_ADMIN_PASSWORD environment variable or ldap.admin.password system property for secure configuration.");
                 ldapPassword = "secret";