[BUG] Corpus with different time spans were not displayed

https://forge.iscpif.fr/issues/1407
[FEATURE] View should be 'linear' by default, not 'bundle'
https://forge.iscpif.fr/issues/1388

static/js/gargantext.angular.js

@@ -381,7 +381,7 @@ gargantext.controller("GraphController", function($scope, $http, $element) {
                 y: {key: 'y', type: 'linear', type: 'numeric'},
             },
             tension: 1.0,
-            lineMode: 'bundle',
+            lineMode: 'linear',
             tooltip: {mode: 'scrubber', formatter: function(x, y, series) {
                 var grouping = groupings.datetime[$scope.groupingKey];
                 return grouping.representation(x) + ' → ' + y;
@@ -442,6 +442,13 @@ gargantext.controller("GraphController", function($scope, $http, $element) {
             angular.forEach(results, function(result, r){
                 var x = grouping.truncate(result[0]);
                 var y = parseFloat(result[1]);
+                if (dataObject[x] === undefined) {
+                    var row = [];
+                    angular.forEach($scope.datasets, function(){
+                        row.push(0);
+                    });
+                    dataObject[x] = row;
+                }
                 dataObject[x][datasetIndex] += y;
             });
         });

templates/tests/mvc.html

@@ -294,7 +294,7 @@
                     <br/>
                     Interpolation:
                     <select ng-model="graph.options.lineMode">
-                        <option ng-repeat="mode in ['bundle', 'linear']" value="{{ mode }}">{{ mode }}</option>
+                        <option ng-repeat="mode in ['linear', 'bundle']" value="{{ mode }}">{{ mode }}</option>
                     </select>
                     <span ng-if="graph.options.lineMode != 'linear'">
                         with a tension of