do not check all words with synonym library if the library is empty

source/net/yacy/cora/language/synonyms/SynonymLibrary.java

@@ -84,6 +84,10 @@ public class SynonymLibrary {
         }
     }
 
+    public int size() {
+        return this.lib.size();
+    }
+    
     /**
      * for a given word, return a list of synonym words
      * @param word

source/net/yacy/document/Condenser.java

@@ -219,7 +219,7 @@ public final class Condenser {
             document.addMetatags(this.tags);
         }
 
-        if (synlib != null) {
+        if (synlib != null && synlib.size() > 0) {
             for (String word: this.words.keySet()) {
                 Set<String> syms = synlib.getSynonyms(word);
                 if (syms != null) this.synonyms.addAll(syms);
@@ -228,7 +228,7 @@ public final class Condenser {
         String text = document.getTextString();
         
         // create the synonyms set
-        if (synonyms != null) {
+        if (synonyms != null && synlib.size() > 0) {
             for (String word: this.words.keySet()) {
                 Set<String> syms = synlib.getSynonyms(word);
                 if (syms != null) this.synonyms.addAll(syms);