Added check key not found

Author: SandraBarmina

datajack-api/src/main/java/ru/sbtqa/tag/datajack/Stash.java

@@ -2,6 +2,7 @@
 
 import java.util.HashMap;
 import java.util.Map;
+import ru.sbtqa.tag.datajack.exceptions.DataException;
 
 /**
  * Temporary data storage. Put data to this storage as key-value pair to use it
@@ -55,7 +56,11 @@ public static void put(String key, Object value) {
      * @param key the key as a {@link java.lang.String} object
      * @return an object found by specified key
      */
-    public static <T> T getValue(String key) {
+    public static <T> T getValue(String key) throws DataException {
+        Map vault = getThreadVault();
+        if (!vault.containsKey(key)) {
+            throw new DataException(String.format("Key '%s' not found in stash", key));
+        }
         return (T) getThreadVault().get(key);
     }