more placeholder code and 'NO BEST TRANSLATION' to stderr for pb

moses-cmd/Main.cpp

@@ -304,6 +304,10 @@ public:
             debug << "BEST TRANSLATION: " << *bestHypo << endl;
           }
         }
+        else {
+      	  VERBOSE(1, "NO BEST TRANSLATION" << endl);
+        }
+
         out << endl;
       }
 

phrase-extract/extract-main.cpp

@@ -928,6 +928,14 @@ bool ExtractTask::checkPlaceholders (const SentenceAlignment &sentence, int star
       if (sentence.alignedToT[pos].size() != 1) {
         return false;
       }
+      else {
+    	  // check it actually lines up to another placeholder
+    	  int targetPos = sentence.alignedToT[pos][0];
+    	  const string &otherWord = sentence.target[targetPos];
+    	  if (!isPlaceholder(otherWord)) {
+    		  return false;
+    	  }
+      }
     }
   }