test clone & model; add some test on null value for normalized_reads field

Link to #3943

browser/test/QUnit/testFiles/clone_test.js

@@ -119,7 +119,7 @@ var json_clone6 = {
         "id" : "id6",
         "germline" : "TRG",
         "reads" : [10,10,0,30],
-        "normalized_reads" : [20,20,0,30],
+        "normalized_reads" : [20,20,0,null],
     }
 
 QUnit.test("name, informations, getHtmlInfo", function(assert) {

browser/test/QUnit/testFiles/model_test.js

@@ -423,6 +423,12 @@ QUnit.test("normalization", function(assert) {
     m.initClones()
     assert.equal(m.have_external_normalization, false, "Model have_external_normalization is correctly resetted")
 
+
+    m.set_normalization(m.NORM_EXTERNAL)
+    assert.equal(m.normalize_reads(c6, 0, undefined), 20, "normalize_reads; get normalized value if present")
+    assert.equal(m.normalize_reads(c6, 0, false),     10, "normalize_reads; get raw value if specified" )
+    assert.equal(m.normalize_reads(c6, 2, undefined),  0, "normalize_reads; get value at 0 as computed by external normalization" )
+    assert.equal(m.normalize_reads(c6, 3, undefined), 30, "normalize_reads; get raw value if normalization equal null")
 })
 
 QUnit.test("findGermlineFromGene", function(assert) {