Fix crasher in Grapher if no hands returned.

Should alert user or at least draw something in right pane.

pyfpdb/GuiGraphViewer.py

@@ -83,7 +83,10 @@ class GuiGraphViewer (threading.Thread):
         self.ax.set_xlabel("Hands", fontsize = 12)
         self.ax.set_ylabel("$", fontsize = 12)
         self.ax.grid(color='g', linestyle=':', linewidth=0.2)
-        #This line will crash if no hands exist in the query.
+        if(line == None):
+            #TODO: Do something useful like alert user
+            print "No hands returned by graph query"
+        else:
             text = "All Hands, " + sitename + str(name) + "\nProfit: $" + str(line[-1]) + "\nTotal Hands: " + str(len(line))
 
             self.ax.annotate(text,
@@ -92,7 +95,6 @@ class GuiGraphViewer (threading.Thread):
                              horizontalalignment='left', verticalalignment='top',
                              fontsize=10)
 
-
             #Draw plot
             self.ax.plot(line,)
 
@@ -106,6 +108,9 @@ class GuiGraphViewer (threading.Thread):
         #returns (HandId,Winnings,Costs,Profit)
         winnings = self.db.cursor.fetchall()
 
+        if(winnings == ()):
+            return None
+
         y=map(lambda x:float(x[3]), winnings)
         line = cumsum(y)
         return line/100