DEV: minor fixes

Author: Vini2

src/agtools/assemblers/_contig_graph_base.py

@@ -51,7 +51,8 @@ def get_graph_edges(
 
         while line != "":
             # Identify lines with link information
-            if "L" in line:
+            tag = line[0]
+            if tag == "L":
                 lcount += 1
                 strings = line.split("\t")
                 source = segment_name_to_id[strings[1]]

src/agtools/cli.py

@@ -160,7 +160,7 @@ def filter(ctx, graph, min_length, output):
     "-f",
     help="path to the FASTA file",
     type=click.Path(exists=True),
-    required=False,
+    required=True,
 )
 @click.option(
     "--assembler",