Merge pull request #212 from gocd/fix-null-ca-cert-data

Treat blank CA Cert data as null

src/main/java/cd/go/contrib/secrets/kubernetes/models/SecretConfig.java

@@ -61,7 +61,7 @@ public String getSecurityToken() {
     }
 
     public String getClusterCACertData() {
-        return clusterCACertData;
+        return clusterCACertData != null && clusterCACertData.isBlank() ? null : clusterCACertData;
     }
 
     public String getNamespace() {

src/test/java/cd/go/contrib/secrets/kubernetes/models/SecretConfigTest.java

@@ -0,0 +1,22 @@
+package cd.go.contrib.secrets.kubernetes.models;
+
+import cd.go.plugin.base.GsonTransformer;
+import org.junit.jupiter.api.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class SecretConfigTest {
+
+    @Test
+    public void shouldConsiderBlankCertAsNull() {
+        final Map<String, Object> settings = new HashMap<>();
+        settings.put("kubernetes_cluster_ca_cert", "   ");
+
+        SecretConfig config = GsonTransformer.fromJson(GsonTransformer.toJson(settings), SecretConfig.class);
+
+        assertThat(config.getClusterCACertData()).isNull();
+    }
+}