fix(plugins/lines): handle no history data

.github/workflows/examples.yml

@@ -289,7 +289,6 @@ jobs:
             @use.patterns
             */*
             +lowlighter/metrics
-            +lowlighter/brain
           output_action: none
           delay: 120
           user: lowlighter

source/plugins/lines/examples.yml

@@ -20,4 +20,3 @@
       @use.patterns
       */*
       +lowlighter/metrics
-      +lowlighter/brain

source/plugins/lines/index.mjs

@@ -71,11 +71,12 @@ export default async function({login, data, imports, rest, q, account}, {enabled
 
     //Diff graphs
     if (sections.includes("history")) {
+      const weeks = result.weeks.filter(({date}) => !_history_limit ? true : new Date(date) > new Date(new Date().getFullYear() - _history_limit, 0, 0))
+      if (weeks.length) {
         //Generate SVG
         const height = 315, width = 480
         const margin = 5, offset = 34
         const {d3} = imports
-      const weeks = result.weeks.filter(({date}) => !_history_limit ? true : new Date(date) > new Date(new Date().getFullYear() - _history_limit, 0, 0))
         const d3n = new imports.D3node()
         const svg = d3n.createSVG(width, height)
 
@@ -120,6 +121,11 @@ export default async function({login, data, imports, rest, q, account}, {enabled
         }
         result.history = d3n.svgString()
       }
+      else {
+        console.debug(`metrics/compute/${login}/plugins > lines > no history data`)
+        result.history = null
+      }
+    }
 
     //Results
     return result

tests/cases/lines.plugin.yml

@@ -18,6 +18,5 @@
       @use.patterns
       */*
       +lowlighter/metrics
-      +lowlighter/brain
     use_mocked_data: 'yes'
     verify: 'yes'