Fix issue with empty xml resulting in parse errors.

gradle.properties

@@ -1,2 +1,2 @@
 group         = biz.nellemann.hmci
-version       = 1.0.7
+version       = 1.0.8

src/main/groovy/biz/nellemann/hmci/HmcClient.groovy

@@ -149,6 +149,11 @@ class HmcClient {
         String responseBody = response.body.string()
         Map<String,ManagedSystem> managedSystemsMap = new HashMap<String, ManagedSystem>()
 
+        // Do not try to parse empty response
+        if(responseBody.empty || responseBody.size() < 1) {
+            return managedSystemsMap
+        }
+
         def feed = new XmlSlurper().parseText(responseBody)
         feed?.entry?.each { entry ->
             entry.content.each { content ->
@@ -182,8 +187,13 @@ class HmcClient {
         URL url = new URL(String.format("%s/rest/api/uom/ManagedSystem/%s/LogicalPartition", baseUrl, system.id))
         Response response = getResponse(url)
         String responseBody = response.body.string()
-
         Map<String, LogicalPartition> partitionMap = new HashMap<String, LogicalPartition>() {}
+
+        // Do not try to parse empty response
+        if(responseBody.empty || responseBody.size() < 1) {
+            return partitionMap
+        }
+
         def feed = new XmlSlurper().parseText(responseBody)
         feed?.entry?.each { entry ->
             //log.debug("Entry")

src/test/groovy/biz/nellemann/hmci/HmcClientTest.groovy

@@ -21,6 +21,18 @@ class HmcClientTest extends Specification {
         mockServer.shutdown()
     }
 
+    void "test against empty xml"() {
+        setup:
+        def testXml = ""
+        mockServer.enqueue(new MockResponse().setBody(testXml));
+
+        when:
+        Map<String, ManagedSystem> systems = hmc.getManagedSystems()
+
+        then:
+        systems.size() == 0
+    }
+
 
     void "test getManagedSystems"() {
         setup: