Merge pull request #11 from myrle-krantz/develop

Setting message for illegal state exception to make debugging easier …
diff --git a/src/main/java/io/mifos/core/lang/TenantContextHolder.java b/src/main/java/io/mifos/core/lang/TenantContextHolder.java
index 175f918..d9abd9f 100644
--- a/src/main/java/io/mifos/core/lang/TenantContextHolder.java
+++ b/src/main/java/io/mifos/core/lang/TenantContextHolder.java
@@ -34,7 +34,9 @@
   }
 
   @SuppressWarnings("WeakerAccess")
-  public static String checkedGetIdentifier() { return identifier().orElseThrow(IllegalStateException::new);}
+  public static String checkedGetIdentifier() {
+    return identifier().orElseThrow(() -> new IllegalStateException("Tenant context not set."));
+  }
 
   public static void setIdentifier(@Nonnull final String identifier) {
     Assert.notNull(identifier, "A tenant identifier must be given.");