Fix function to calc editing efficiency where there are no reads

Dockerfile

@@ -15,4 +15,4 @@ ENV PATH="${VENV}/bin:$PATH"
 
 # Install from PyPI
 RUN pip install --upgrade pip
-RUN pip install crispr-ambiguous-mapping==0.0.140
+RUN pip install crispr-ambiguous-mapping==0.0.141

crispr-ambiguous-mapping/crispr_ambiguous_mapping/utility/crispr_editing_utility.py

@@ -1,5 +1,10 @@
 from typing import Counter as CounterType
 
 def calculate_average_editing_frequency(total_mutation_counter: CounterType) -> float:
-    editing_efficiency = (sum(total_mutation_counter.values()) - total_mutation_counter[0])/sum(total_mutation_counter.values())
-    return editing_efficiency
+    total_editing_counts = (sum(total_mutation_counter.values()) - total_mutation_counter[0])
+    total_counts = sum(total_mutation_counter.values())
+    if total_counts > 0:
+        editing_efficiency = total_editing_counts/total_counts
+        return editing_efficiency
+    else:
+        return 0

crispr-ambiguous-mapping/pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "crispr-ambiguous-mapping"
-version = "0.0.140"
+version = "0.0.141"
 description = ""
 authors = ["Basheer Becerra <[email protected]>"]
 readme = "README.md"