Return an empty array instead of a null for empty molecules - not sure this make sense but no harm.

johnmay · johnmay · commit b0fbac074ad4 · 2021-01-17T21:39:34.000Z
diff --git a/base/standard/src/main/java/org/openscience/cdk/graph/invariant/Canon.java b/base/standard/src/main/java/org/openscience/cdk/graph/invariant/Canon.java
@@ -280,6 +280,9 @@ private long[] refine(long[] invariants, boolean[] hydrogens) {
             System.arraycopy(nextVs, 0, currVs, 0, nnu);
         }
 
+        if (symmetry == null)
+            symmetry = new long[0];
+
         return symmetry;
     }
 

Original file line number	Diff line number	Diff line change
`@@ -280,6 +280,9 @@ private long[] refine(long[] invariants, boolean[] hydrogens) {`
`280`	`280`	`System.arraycopy(nextVs, 0, currVs, 0, nnu);`
`281`	`281`	`}`
`282`	`282`
	`283`	`+ if (symmetry == null)`
	`284`	`+ symmetry = new long[0];`
	`285`	`+`
`283`	`286`	`return symmetry;`
`284`	`287`	`}`
`285`	`288`