More graceful handling of EPS images in which non-existing XMP metadata is announced

src/epsimage.cpp

@@ -633,11 +633,10 @@ namespace {
         if (containsXmp) {
             // search for XMP metadata
             findXmp(xmpPos, xmpSize, data, posEps, posEndEps, write);
-            if (xmpSize == 0) {
+            if (xmpPos == posEndEps) {
                 #ifndef SUPPRESS_WARNINGS
                 EXV_WARNING << "Unable to find XMP metadata as announced at position: " << posContainsXmp << "\n";
                 #endif
-                throw Error(write ? 21 : 14);
             }
             // check embedding of XMP metadata
             const size_t posLineAfterXmp = readLine(line, data, xmpPos + xmpSize, posEndEps);

test/data/eps/eps-flat_photoshop-cs5-ascii_failure-bigxmp.xmp

@@ -0,0 +1 @@
+<?xml version="1.0" encoding="UTF-8"?>

test/data/eps/eps-test.out

@@ -2525,9 +2525,22 @@ Exit code: 0
 
 Command: exiv2 -u -pa eps-flat_photoshop-cs5-ascii_failure-bigxmp.eps
 Warning: Unable to find XMP metadata as announced at position: 291
-Exiv2 exception in print action for file eps-flat_photoshop-cs5-ascii_failure-bigxmp.eps:
-Failed to read image data
-Exit code: 1
+Exit code: 253
+
+Command: exiv2 -f -eX eps-flat_photoshop-cs5-ascii_failure-bigxmp.eps
+Warning: Unable to find XMP metadata as announced at position: 291
+Exit code: 0
+
+Command: exiv2 -ix eps-flat_photoshop-cs5-ascii_failure-bigxmp.eps
+Warning: Unable to find XMP metadata as announced at position: 291
+Warning: Unable to find XMP metadata as announced at position: 291
+Exit code: 0
+
+Command: (2) exiv2 -ix eps-flat_photoshop-cs5-ascii_failure-bigxmp.eps
+Exit code: 0
+
+Command: exiv2 -f -ex eps-flat_photoshop-cs5-ascii_failure-bigxmp.eps
+Exit code: 0
 
 -----> eps-flat_photoshop-cs5-binary-preview.eps <-----
 

test/data/preview/preview-test.out

@@ -180,15 +180,11 @@ Exit code: 0
 
 Command: exiv2 -pp eps-flat_photoshop-cs5-ascii_failure-bigxmp.eps
 Warning: Unable to find XMP metadata as announced at position: 291
-Exiv2 exception in print action for file eps-flat_photoshop-cs5-ascii_failure-bigxmp.eps:
-Failed to read image data
-Exit code: 1
+Exit code: 0
 
 Command: exiv2 -f -ep eps-flat_photoshop-cs5-ascii_failure-bigxmp.eps
 Warning: Unable to find XMP metadata as announced at position: 291
-Exiv2 exception in extract action for file eps-flat_photoshop-cs5-ascii_failure-bigxmp.eps:
-Failed to read image data
-Exit code: 1
+Exit code: 0
 
 -----> eps-flat_photoshop-cs5-binary-preview.eps <-----