draw_hierarchy(): Fix warnings for inline drawing

24 jobs for master in 258 minutes and 26 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Test
passed job_clang_amd64 #3274
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passed job_clang_amd64_nosh #3278
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passed job_clang_py2_amd64 #3276
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02:56:23

passed job_gcc_amd64 #3273
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passed job_gcc_amd64_nosh #3277
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passed job_gcc_py2_amd64 #3275
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02:14:22

failed job_clang_amd64 #3226
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failed job_clang_amd64 #3178
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failed job_clang_amd64 #3136
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00:00:01

failed job_clang_amd64_nosh #3234
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failed job_clang_amd64_nosh #3182
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failed job_clang_amd64_nosh #3140
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failed job_clang_py2_amd64 #3229
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failed job_clang_py2_amd64 #3180
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failed job_clang_py2_amd64 #3138
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failed job_gcc_amd64 #3225
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failed job_gcc_amd64 #3177
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failed job_gcc_amd64 #3135
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00:00:01

failed job_gcc_amd64_nosh #3231
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failed job_gcc_amd64_nosh #3181
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failed job_gcc_amd64_nosh #3139
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failed job_gcc_py2_amd64 #3228
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failed job_gcc_py2_amd64 #3179
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failed job_gcc_py2_amd64 #3137
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00:00:00