- adds non-null import

Author: baywet

src/main/java/com/microsoft/graph/http/GraphInnerError.java

@@ -25,6 +25,7 @@
 import com.google.gson.annotations.SerializedName;
 
 import javax.annotation.Nullable;
+import javax.annotation.Nonnull;
 
 /**
  * Represents an inner error returned by the service