Always fallback to system font on font failure.

The font in the PDF is marked as a CIDFontType0, but the font file is
actually a true type font. To fully address this issue we should really
peek into the font file and try to determine what it is. However, this
is the first case of this issue, so I think this solution is acceptable for
now.

src/core/fonts.js

@@ -621,9 +621,6 @@ var Font = (function FontClosure() {
           throw new FormatError(`Font ${type} is not supported`);
       }
     } catch (e) {
-      if (!(e instanceof FormatError)) {
-        throw e;
-      }
       warn(e);
       this.fallbackToSystemFont();
       return;

test/pdfs/.gitignore

@@ -88,6 +88,7 @@
 !bug1068432.pdf
 !bug1146106.pdf
 !bug1252420.pdf
+!issue9949.pdf
 !bug1308536.pdf
 !bug1337429.pdf
 !issue5564_reduced.pdf

test/test_manifest.json

@@ -578,6 +578,12 @@
        "annotations": true,
        "about": "PDF with annotations, some of which have the Hidden flag set."
     },
+    {  "id": "issue9949",
+       "file": "pdfs/issue9949.pdf",
+       "md5": "55d24d7fc71b849818ea91d3b9eaf302",
+       "rounds": 1,
+       "type": "eq"
+    },
     {  "id": "issue4665-text",
        "file": "pdfs/issue4665.pdf",
        "md5": "0de1308432819c101881df7ca4424575",