Alway return something in non-void functions

There were functions defined as non-void but didn't have return value
for all possible passes. This can result in undefined behavior. Fixed
this issue and returning values that somehow makes sense hopefully.

scripts/ems/biconcor/PhrasePairCollection.cpp

@@ -87,6 +87,7 @@ bool PhrasePairCollection::GetCollection( const vector< string > sourceString )
     }
   }
   sort(m_collection.begin(), m_collection.end(), CompareBySize());
+  return true;
 }
 
 void PhrasePairCollection::Print()

scripts/training/phrase-extract/extract.cpp

@@ -601,6 +601,7 @@ string getOrientString(REO_POS orient, REO_MODEL_TYPE modelType)
     }
     break;
   }
+  return "";
 }
 
 void addPhrase( SentenceAlignment &sentence, int startE, int endE, int startF, int endF , string &orientationInfo)