Add branch test

TESTS/TEST_PHISTOGRAM/main.cpp

@@ -40,9 +40,11 @@ bool testPHistogram(){
 	
 	PHistogram<float> emptyHist;
 	std::cout << emptyHist << std::endl;
+	emptyHist.normalize();
 	
 	PHistogram<float> singleValueHist(1lu);
 	std::cout << singleValueHist << std::endl;
+	emptyHist.normalize();
 	
 	return b;
 }
@@ -57,6 +59,7 @@ bool testPHistogram2(){
 	float tabValue[] = {1.0f,4.0f,6.0f,3.0f,6.0f,6.0f,7.0f,4.0f,3.0f,7.0f,5.0f,3.0f,5.0f,6.0f};
 	
 	hist.addValue(NULL, 0lu);
+	hist.addValue(NULL, 42lu);
 	hist.setValueRange(tabValue, 14lu);
 	hist.addValue(tabValue, 14lu);