Fixed useless Exception throwing in w3af.

Exception is thrown in this line: https://github.com/andresriancho/w3af/blob/ecfed326f6500fbef81b6e5d56c7c37f3cb9f5b9/w3af/core/ui/api/utils/scans.py#L95
Added OSError to the catch clause.

Dockerfile

@@ -3,7 +3,7 @@ FROM ubuntu:18.04
 COPY install/base.sh /tmp/install/
 RUN chmod +x /tmp/install/base.sh && /tmp/install/base.sh
 
-COPY install/requirements.txt install/w3af_output_fix.patch install/w3af-lz4.patch /tmp/
+COPY install/requirements.txt install/w3af_output_fix.patch install/w3af-lz4.patch install/w3af-scans.py.patch /tmp/
 COPY install/w3af.sh /tmp/install/
 RUN chmod +x /tmp/install/w3af.sh && /tmp/install/w3af.sh
 

MANIFEST

-VERSION=v1.3.3
+VERSION=v1.3.4
 SERVICE=vat-genscan
 

install/w3af-scans.py.patch

+96c96
+<         except (AttributeError, IOError) as _:
+---
+>         except (AttributeError, IOError, OSError) as _:

install/w3af.sh

@@ -33,4 +33,5 @@ mv w3af-1910600684c22c767a1105fbfcb051db73ad1280 /service/w3af
 #enable other output plugins for w3af API
 patch /service/w3af/w3af/core/ui/api/utils/scans.py /tmp/w3af_output_fix.patch
 patch /service/w3af/w3af/core/controllers/dependency_check/requirements.py /tmp/w3af-lz4.patch
+patch /service/w3af/w3af/core/ui/api/utils/scans.py /tmp/w3af-scans.py.patch