cleanup

xml/relaxng/src/org/intellij/plugins/relaxNG/compact/psi/impl/PatternReference.java

@@ -108,6 +108,7 @@ class PatternReference extends PsiReferenceBase.Poly<RncRef> implements Function
     return PsiTreeUtil.getParentOfType(myElement, RncGrammar.class, true, PsiFile.class);
   }
 
+  @NotNull
   public String getCanonicalText() {
     final ASTNode node = findNameNode();
     return node != null ? EscapeUtil.unescapeText(node) : "";

xml/relaxng/src/org/intellij/plugins/relaxNG/compact/psi/impl/RncNameImpl.java

@@ -102,6 +102,7 @@ public class RncNameImpl extends RncElementImpl implements RncName, PsiReference
     return resolver.getResult();
   }
 
+  @NotNull
   public String getCanonicalText() {
     return getRangeInElement().substring(getText());
   }