From b32a6b50d29bcda2cbc8bbeaaa28ef854100138c Mon Sep 17 00:00:00 2001
From: Matthias <matmair@live.de>
Date: Sun, 20 Jun 2021 20:16:14 +0200
Subject: [PATCH 1/3] fixes #1671

---
 InvenTree/stock/templates/stock/item_base.html | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/InvenTree/stock/templates/stock/item_base.html b/InvenTree/stock/templates/stock/item_base.html
index fa91177bf6..7aebd51452 100644
--- a/InvenTree/stock/templates/stock/item_base.html
+++ b/InvenTree/stock/templates/stock/item_base.html
@@ -325,7 +325,7 @@
         <td><a href="{% url 'po-detail' item.purchase_order.id %}">{{ item.purchase_order }}</a></td>
     </tr>
     {% endif %}
-    {% if item.purchase_price %}
+    {% if item.purchase_price != None %}
     <tr>
         <td><span class='fas fa-dollar-sign'></span></td>
         <td>{% trans "Purchase Price" %}</td>

From 59aae516528dcb1fa742616373ba2fc2abedc0e3 Mon Sep 17 00:00:00 2001
From: Matthias <matmair@live.de>
Date: Sun, 20 Jun 2021 20:17:01 +0200
Subject: [PATCH 2/3] show stock history starting by 1 element

---
 InvenTree/part/templates/part/order_prices.html | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/InvenTree/part/templates/part/order_prices.html b/InvenTree/part/templates/part/order_prices.html
index a9da632a33..5e5552c5f9 100644
--- a/InvenTree/part/templates/part/order_prices.html
+++ b/InvenTree/part/templates/part/order_prices.html
@@ -137,7 +137,7 @@
     <hr>
     <h4>{% trans 'Stock Pricing' %}<i class="fas fa-info-circle" title="Shows the purchase prices of stock for this part.
 The part single price is the current purchase price for that supplier part."></i></h4>
-    {% if price_history|length > 1 %}
+    {% if price_history|length > 0 %}
         <div style="max-width: 99%; min-height: 300px">
             <canvas id="StockPriceChart"></canvas>
         </div>

From a0b83d530cb51738969617e7edc810c13ce137a8 Mon Sep 17 00:00:00 2001
From: Matthias <matmair@live.de>
Date: Sun, 20 Jun 2021 20:19:11 +0200
Subject: [PATCH 3/3] refactor

---
 InvenTree/part/views.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/InvenTree/part/views.py b/InvenTree/part/views.py
index b68c889516..39e0f13b45 100644
--- a/InvenTree/part/views.py
+++ b/InvenTree/part/views.py
@@ -814,7 +814,7 @@ class PartPricingView(PartDetail):
         part = self.get_part()
         # Stock history
         if part.total_stock > 1:
-            ret = []
+            price_history = []
             stock = part.stock_entries(include_variants=False, in_stock=True)  # .order_by('purchase_order__date')
             stock = stock.prefetch_related('purchase_order', 'supplier_part')
 
@@ -841,9 +841,9 @@ class PartPricingView(PartDetail):
                     line['date'] = stock_item.purchase_order.issue_date.strftime('%d.%m.%Y')
                 else:
                     line['date'] = stock_item.tracking_info.first().date.strftime('%d.%m.%Y')
-                ret.append(line)
+                price_history.append(line)
 
-            ctx['price_history'] = ret
+            ctx['price_history'] = price_history
 
         # BOM Information for Pie-Chart
         if part.has_bom: