diff --git a/src/main/java/pl/com/it_crowd/youtrack/api/YoutrackAPI.java b/src/main/java/pl/com/it_crowd/youtrack/api/YoutrackAPI.java
index 208364a..8db462e 100644
--- a/src/main/java/pl/com/it_crowd/youtrack/api/YoutrackAPI.java
+++ b/src/main/java/pl/com/it_crowd/youtrack/api/YoutrackAPI.java
@@ -105,9 +105,18 @@ public class YoutrackAPI {
         return new DefaultHttpClient(cm);
     }
 
-    private static boolean isBlank(String string)
+    private static boolean isBlank(String str)
     {
-        return string != null && string.trim().length() > 0;
+        int strLen;
+        if (str == null || (strLen = str.length()) == 0) {
+            return true;
+        }
+        for (int i = 0; i < strLen; i++) {
+            if ((!Character.isWhitespace(str.charAt(i)))) {
+                return false;
+            }
+        }
+        return true;
     }
 
 // --------------------------- CONSTRUCTORS ---------------------------
@@ -153,16 +162,16 @@ public class YoutrackAPI {
         final HttpPost request = new HttpPost(serviceLocation + "/rest/issue/" + issueId + "/execute");
         final List<BasicNameValuePair> parameters = new ArrayList<BasicNameValuePair>();
         parameters.add(new BasicNameValuePair("command", command));
-        if (isBlank(comment)) {
+        if (!isBlank(comment)) {
             parameters.add(new BasicNameValuePair("comment", comment));
         }
-        if (isBlank(group)) {
+        if (!isBlank(group)) {
             parameters.add(new BasicNameValuePair("group", group));
         }
         if (disableNotifications != null) {
             parameters.add(new BasicNameValuePair("disableNotifications", disableNotifications.toString()));
         }
-        if (isBlank(runAs)) {
+        if (!isBlank(runAs)) {
             parameters.add(new BasicNameValuePair("runAs", runAs));
         }
         request.setEntity(new UrlEncodedFormEntity(parameters));
@@ -297,42 +306,6 @@ public class YoutrackAPI {
         return wrappedIssues;
     }
 
-    public void setTotalBilledHours(String issueSignature, Long billedHours)
-    {
-        //QA-SUGGESTION this method should not be in this project, remove it from this class
-        final URI uri;
-        try {
-            uri = new URIBuilder(serviceLocation + "/rest/issue/" + issueSignature + "/execute").build();
-        } catch (URISyntaxException e) {
-            throw new RuntimeException(e);
-        }
-        try {
-            final HttpPost request = new HttpPost(uri);
-            request.getParams().setParameter("command", "Billed hours " + billedHours);
-            execute(request);
-        } catch (IOException e) {
-            throw new RuntimeException(e);
-        }
-    }
-
-    public void setTotalIssueDuration(String issueSignature, Long issueTotalDuration)
-    {
-        //QA-SUGGESTION this method should not be in this project, remove it from this class
-        final URI uri;
-        try {
-            uri = new URIBuilder(serviceLocation + "/rest/issue/" + issueSignature + "/execute").build();
-        } catch (URISyntaxException e) {
-            throw new RuntimeException(e);
-        }
-        try {
-            final HttpPost request = new HttpPost(uri);
-            request.getParams().setParameter("command", "Real completion time " + issueTotalDuration).setParameter("disableNotifications", true);
-            execute(request);
-        } catch (IOException e) {
-            throw new RuntimeException(e);
-        }
-    }
-
     private HttpPut createPutRequest(URI uri, BasicNameValuePair... nameValuePair) throws UnsupportedEncodingException
     {
         final HttpPut request = new HttpPut(uri);