Handle rank sometimes being sent as empty string (#105)

Optional informative text (not to be included in commit message) relevant to reviewers.

scenario/createsheet.go

@@ -17,7 +17,6 @@ type (
 		ID          string `json:"id" displayname:"Sheet ID" doc-key:"createsheet.id"`
 		Title       string `json:"title" displayname:"Sheet title" doc-key:"createsheet.title"`
 		Description string `json:"description" displayname:"Sheet description" doc-key:"createsheet.description"`
-		// todo add option to change sheet to this sheet after creation, should probably be default
 	}
 )
 
@@ -46,12 +45,12 @@ func (settings CreateSheetSettings) Execute(sessionState *session.State,
 	}
 
 	metaDef := creation.StubMetaDef(settings.Title, settings.Description)
-	metaDef["rank"] = 0.0 //TODO (?) Support rank
 
 	props := map[string]interface{}{
 		"qMetaDef": metaDef,
 		"qInfo":    creation.StubNxInfo("sheet"),
 		"cells":    []interface{}{},
+		"rank":     0.0,
 	}
 
 	err := sessionState.SendRequest(actionState, func(ctx context.Context) error {

senseobjects/sheetlist.go

@@ -35,9 +35,9 @@ type (
 			Name string `json:"name,omitempty"`
 			Type string `json:"type,omitempty"`
 		} `json:"cells,omitempty"`
-		Title       string  `json:"title,omitempty"`
-		Description string  `json:"description,omitempty"`
-		Rank        float64 `json:"rank,omitempty"`
+		Title       string      `json:"title,omitempty"`
+		Description string      `json:"description,omitempty"`
+		Rank        interface{} `json:"rank,omitempty"`
 	}
 
 	// SheetListPropertiesData properties of sheetlist
@@ -94,7 +94,15 @@ func (sheetList *SheetList) UpdateLayout(ctx context.Context) error {
 			if item1 == nil || item2 == nil || item1.Data == nil || item2.Data == nil {
 				return false
 			}
-			return sheetItems[i].Data.Rank < sheetItems[j].Data.Rank
+			iRank, ok := sheetItems[i].Data.Rank.(float64)
+			if !ok {
+				iRank = 0
+			}
+			jRank, ok := sheetItems[j].Data.Rank.(float64)
+			if !ok {
+				jRank = 0
+			}
+			return iRank < jRank
 		})
 	}