fix

Author: Lukas Molzberger

src/main/java/network/aika/neuron/activation/Activation.java

@@ -669,6 +669,9 @@ private Activation getInputExcitatoryActivation() {
 
 
     private Link getStrongestLink() {
+        if(inputLinks.size() == 1) {
+            return inputLinks.firstEntry().getValue();
+        }
         return inputLinks
                 .values()
                 .stream()