fix the_line_after_metadata()

tools/article_utils.py

@@ -2,7 +2,7 @@ import time, subprocess
 
 def the_line_after_metadata(lines: []) -> int:
     i = 0
-    while lines[i].strip():
+    while i < len(lines) and lines[i].strip():
         i += 1
     return i
 
@@ -19,7 +19,7 @@ def parse_metadata(filepath: str) -> {}:
             result["Date"] = time.gmtime(int(val))
         elif key == "Tags":
             result["Tags"] = [v.strip() for v in val.split(",")]
-        else:
+        elif val:
             result[key] = val
         result["Last Edit"] = time.gmtime(int(subprocess.getoutput(r"stat -c %Y " + filepath)))