[bug:1274] added conditional to ensure that when multiple bond stereo…

… is specified as attributes and characters only one is used. This is achieved by using the existing flag to determine if a stereo bond value has already been provided.

Change-Id: I2a4e64b1df2cbfdc5a3dfe5d8ff9a13c11f94e98
Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>

src/main/org/openscience/cdk/io/cml/CMLCoreModule.java

@@ -829,7 +829,7 @@ public void endElement(CMLStack xpath, String uri, String name, String raw) {
                 formalCharges.add(charge);
             }
         } else if ("bondStereo".equals(name)){
-            if(!currentChars.isEmpty()){
+            if(!currentChars.isEmpty() && !stereoGiven){
                 bondStereo.add(currentChars);
                 stereoGiven = Boolean.TRUE;
             }