handle case where no unicode value is found for type 1 fonts.

src/UglyToad.Pdf.Tests/Integration/LocalTests.cs

@@ -0,0 +1,15 @@
+namespace UglyToad.Pdf.Tests.Integration
+{
+    using Xunit;
+
+    /// <summary>
+    /// A class for testing files which are not checked in to source control.
+    /// </summary>
+    public class LocalTests
+    {
+        [Fact]
+        public void Tests()
+        {
+        }
+    }
+}

src/UglyToad.Pdf/Fonts/Cmap/CharacterMapBuilder.cs

@@ -95,6 +95,8 @@
                 return new CharacterIdentifierSystemInfo(SystemInfoBuilder.Registry, SystemInfoBuilder.Ordering, SystemInfoBuilder.Supplement);
             }
 
+            return CharacterIdentifierSystemInfo;
+
             throw new InvalidOperationException("The Character Identifier System Information was never set.");
         }
 

src/UglyToad.Pdf/Fonts/Simple/TrueTypeSimpleFont.cs

@@ -68,7 +68,14 @@
             var encodedCharacterName = encoding.GetName(characterCode);
 
             // Look up the character name in the Adobe Glyph List.
-            value = GlyphList.AdobeGlyphList.NameToUnicode(encodedCharacterName);
+            try
+            {
+                value = GlyphList.AdobeGlyphList.NameToUnicode(encodedCharacterName);
+            }
+            catch
+            {
+                return false;
+            }
 
             return true;
         }

src/UglyToad.Pdf/Fonts/Simple/Type1Font.cs

@@ -1,5 +1,6 @@
 namespace UglyToad.Pdf.Fonts.Simple
 {
+    using System;
     using Cmap;
     using Composite;
     using Core;
@@ -58,7 +59,14 @@
 
             var name = encoding.GetName(characterCode);
 
-            value = GlyphList.AdobeGlyphList.NameToUnicode(name);
+            try
+            {
+                value = GlyphList.AdobeGlyphList.NameToUnicode(name);
+            }
+            catch
+            {
+                return false;
+            }
 
             return true;
         }