Remove null check because of guarantee of non-null

Change-Id: I447532cae2f8cf801a8560e20e74df94f2f5e5ec
diff --git a/core/net/src/main/java/org/onlab/onos/net/intent/impl/PathIntentInstaller.java b/core/net/src/main/java/org/onlab/onos/net/intent/impl/PathIntentInstaller.java
index 9c196a2..2505be5 100644
--- a/core/net/src/main/java/org/onlab/onos/net/intent/impl/PathIntentInstaller.java
+++ b/core/net/src/main/java/org/onlab/onos/net/intent/impl/PathIntentInstaller.java
@@ -138,9 +138,6 @@
      * @return allocated resources if any are required, null otherwise
      */
     private LinkResourceAllocations allocateResources(PathIntent intent) {
-        if (intent.constraints() == null) {
-            return null;
-        }
         LinkResourceRequest.Builder builder =
                 DefaultLinkResourceRequest.builder(intent.id(), intent.path().links());
         for (Constraint constraint : intent.constraints()) {